Eucrites
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-unbr
Country
Year found
2013
Mass
58 kg
[Museum Collection]
(1) 50.06g
CHRISTIE'S Auction 9-23 Feb 2022 Lot#48
CHRISTIE'S Auction 9-23 Feb 2022 Lot#48
CHRISTIE'S Auction 9-23 Feb 2022 Lot#48
History: An extremely bright fireball was seen by several persons as it moved in an easterly direction over western Algeria in the vicinity of Tindouf at approximately 11 pm on July 17, 2013. No sonic phenomena were documented. Sightings were also made by residents in the Algerian village of Oum el Assel. A search for meteorites was initiated soon after the event, but it was not until April 2014 that a strewnfield was located at 27.120°N, 7.018°W. Subsequently, many fusion-crusted stones were purchased in May 2014 from the finders by Darryl Pitt. Physical characteristics: Fresh stones coated by black fusion crust with numerous anastomozing ridges. Interiors are notable for the bright internal reflections within vitreous plagioclase laths and the unusually abundant, accessory, bronze-colored sulfides. Petrography: (A. Irving and S. Kuehner, UWS) Two studied stones have a subophitic diabasic texture, and exhibit no evidence of deformation or terrestrial alteration. Composed of prismatic exsolved pigeonite grains and calcic plagioclase laths with accessory silica polymorph, Ti-rich chromite, Ti-poor chromite, troilite and ilmenite, plus rare zircon and Ni-free metal. Geochemistry: Low-Ca pyroxene host (Fs57.1-58.0Wo6.2-6.7, FeO/MnO = 29-30, N = 3), high-Ca pyroxene exsolution lamellae (Fs28.1-29.3Wo42.0-41.6, FeO/MnO = 29-31, N = 3), high-Ca pyroxene host (Fs28.1Wo42.3, FeO/MnO = 31), low-Ca pyroxene exsolution lamella (Fs57.6Wo6.4, FeO/MnO = 31), plagioclase (An93.2-94.5Or0.7-0.5, N = 4). Magnetic susceptibility, log χ (× 10-9 m3/kg) = 2.95. Classification: Eucrite (diabasic, unbrecciated). Specimens: 43 g including two polished thin sections at UWB; 51.7 kg (including a 35.9 kg mass) with DPitt and the remainder with anonymous collectors.
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-mmict
Country
Year found
1984
Mass
25 kg
[Museum Collection]
(1) 106.2g
This is 1 of 273 approved meteorites classified as Eucrite-mmict. Search for specimens in the Smithsonian Institution collection (U.S.): Search for this meteorite in the Natural History Museum collection (U.K.): Search for this meteorite in the Museo Nazionale dell'Antartide database (Siena, Italy): Published in Meteoritical Bulletin, no. 64, Meteoritics 21, 309-313 (1986)
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-melt breccia
Country
Year found
2022
Mass
50 kg
[Museum Collection]
(1) 138g (2) 506.7g (3) 1305g (4) 220g
(5) 25.22g
History: Numerous fragments reportedly totalling to almost one metric ton were recovered in Northeastern Libya. Fifty kg of it were subsequently purchased by the main mass holder from a meteorite dealer in Libya. Physical characteristics: Many brownish fragments some of which with small patches of fusion crust. Petrography: Achondritic melt breccia composed of several cm-sized lithic clasts set in abundant recrystallized shock melt. Lithic clasts consist of calcic plagioclase and aggregates of fine-grained, 30-70 µm sized pigeonite crystals displaying patchy compositional zoning. The melt matrix is composed of recrystallized pigeonite displaying mottled compositional zoning and fine-grained, mostly fibrous feldspar. Minor phases include silica, Ti-chromite, ilmenite, and FeS. No metallic iron has been detected. Geochemistry: patchily zoned pigeonite: Fs50.1±1.5Wo11.6±1.7 (Fs48.1-53.4Wo6.9-13.3, FeO/MnO=27-31, n=12); calcic plagioclase: An90.2±0.7 (An88.9-91.3, n=10)
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-mmict
Country
Year found
1821
Mass
91 kg
[Museum Collection]
(1) 5.939g
This is 1 of 279 approved meteorites classified as Eucrite-mmict. Search for specimens in the Smithsonian Institution collection (U.S.): Search for this meteorite in the Natural History Museum collection (U.K.):
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-mmict
Country
Year found
1960
Mass
330 kg
[Museum Collection]
(1) 78g
This is 1 of 273 approved meteorites classified as Eucrite-mmict. Search for specimens in the Smithsonian Institution collection (U.S.): Search for this meteorite in the Natural History Museum collection (U.K.): Search for this meteorite in the Museo Nazionale dell'Antartide database (Siena, Italy): Published in Meteoritical Bulletin, no. 51, Meteoritics 7, 215-232 (1972)
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-mmict
Country
Year found
2021
Mass
1332 g
[Museum Collection]
(1) 20.892g
History: Found September 2020 by Ahmed Enaji. Purchased May 2021 by Matt Morgan. Physical characteristics: Many identical appearing stones. Tan colored, desert weathered exterior. Saw cuts reveal fragmental breccia of white and gray clasts set in a light gray groundmass. Petrography: (C. Agee and A. Ross, UNM) This meteorite is a monomict breccia with approximately 60% pyroxene and 35% plagioclase. The pyroxene compositions are uniformly consistent with a single cumulate eucrite lithology, indicating monomict eucrite. Pyroxenes are highly equilibrated with distinct high-Ca and low-Ca compositional separation. Minor phases observed were silica, Cr-spinel, ilmenite, and troilite. No metal was detected. Geochemistry: (A. Ross, UNM) Low Ca-pyroxene Fs50.8±1.5Wo3.5±1.7, Fe/Mn=31±1, n=7; high Ca-pyroxene Fs22.5±0.8Wo42.1±0.7, Fe/Mn=30±2, n=5; plagioclase An87±1.7. Classification: Cumulate monomict eucrite Specimens: 22 g including a probe mount on deposit at UNM, Matt Morgan holds the main mass.
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-pmict
Country
Year found
2001
Mass
6 kg
[Museum Collection]
(1) 4.5g
This is 1 of 395 approved meteorites classified as Eucrite-pmict. Published in Meteoritical Bulletin, no. 87, MAPS 38, A189-A248 (2003)
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-pmict
Country
Year found
2010
Mass
400 g
[Museum Collection]
(1) 24.28g
This is 1 of 395 approved meteorites classified as Eucrite-pmict. Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-pmict
Country
Year found
2009
Mass
950 g
[Museum Collection]
(1) 19.25g
This is 1 of 406 approved meteorites classified as Eucrite-pmict. Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-pmict
Country
Year found
2011
Mass
5.01 kg
[Museum Collection]
(1) 11.0g (2) 10.3g (3) 3.6g (4) 115g
(5) 24.3g
This is 1 of 395 approved meteorites classified as Eucrite-pmict. Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite
Country
Year found
2011
Mass
455 g
[Museum Collection]
(1) 4.5g (2) 4.3g
History: Purchased by Twelker in 2011 September from a Moroccan dealer at the Denver Mineral Show. Petrography: (A. Irving and S. Kuehner, UWS) Fresh unbrecciated specimen with intersertal texture composed of exsolved pigeonite, calcic plagioclase, silica polymorph, ilmenite and troilite. Geochemistry: Clinopyroxene lamellae (Fs30.0-31.3Wo39.6-39.1, FeO/MnO = 32) in host low-Ca pyroxene (Fs57.1-57.9Wo6.5-8.0, FeO/MnO = 33-35). Classification: Basaltic eucrite (unbrecciated).
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-mmict
Country
Year found
2012
Mass
1216 g
[Museum Collection]
(1) 6.5g
History: Purchased from a Moroccan dealer by Gary Fujihara and Adam Bates in July 2012. Petrography: (A. Irving and S. Kuehner, UWS) Fresh monomict breccia composed of medium-grained basaltic eucrite clasts. Minerals are exsolved pigeonite, calcic plagioclase, silica polymorph, ilmenite, chromite and troilite. Geochemistry: Orthopyroxene Fs61.1-62.3Wo1.7; FeO/MnO = 31), clinopyroxene exsolution lamellae (Fs26.9-27.6Wo43.2-41.8; FeO/MnO = 28-29). Classification: Eucrite (monomict breccia) Specimens: 27.9 g of sample and one polished thin section are on deposit at UWB. The remaining material is held jointly by Gary Fujihara and Adam Bates.
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-pmict
Country
Year found
2013
Mass
2.64 kg
[Museum Collection]
(1) 68.90 g (2) 67.05 g (3) 12.24 g
This is 1 of 408 approved meteorites classified as Eucrite-pmict. Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-br
Country
Year found
2010
Mass
326 g
[Museum Collection]
(1) 4.54g (2) 1.20g
History: Numerous individuals up to several cm in size, all partly covered with fusion crust, were bought at a mineral market in Erfoud, Morocco. Petrography: The meteorite is a breccia composed of basaltic lithologies and mineral fragments set into a fine-grained melt-rich matrix. Calcic plagioclase and exsolved pyroxene are dominant minerals; accessories include SiO2 polymorphs, chromite, and troilite. The rock contains abundant recrystallized shock melt. Geochemistry: low-Ca pyroxene, Fs60±0.9Wo2.9±0.7 (Fs58.3-61.3Wo2.2-4.7, n=15, FeO/MnO=30-34); Ca-pyroxene, Fs26.3±1.1Wo43.5±0.4 (Fs23.5-27.2Wo42.9-44, n=15, FeO/MnO=29-35); calcic plagioclase, An90.5±0.7 (An89.5-91.5, n=15)
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-melt breccia
Country
Year found
2014
Mass
2.53 kg
[Museum Collection]
(1) 3.0g
History: A stone was found in northwest Africa. Moroccan dealer Mohammed Sbai sold the stone to an anonymous collector at the Changsha mineral show in May 2014. Physical characteristics: Single pie-shaped stone has patchy dark-gray irregular surface. Fusion crust is not preserved. Petrography: (C. A. Lorenz, Vernad) The rock is a breccia consisting of coarse-grained gabbro fragments (33 vol%) up to 6 × 3 cm and minor fragments of fine-grained pyroxene-feldspar rocks. The rock fragments are embedded into a fine-grained matrix full of fine mineral and rock fragments. The matrix consists of pyroxene and feldspar needles which form a graphic intergrowth. Geochemistry: (N. N. Kononkova, Vernad, EMP) coarse-grained gabbro-pyroxene Fs57.6Wo4.5 (N=10; Fe/Mn = 30.6) Fs55.0-60.3Wo2.2-7.6; feldspar An91.0Ab8.6 (N=12). Classification: Eucrite melt breccia Specimens: A total of 254.1 g (213.3 g cut piece and 40.8 g slice), one thin section and one thick polished section are on deposit at Vernad. An anonymous collector holds the main mass.
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite
Country
Year found
2010
Mass
286 g
[Museum Collection]
(1) 24.902g
History: purchased in 2010 by M. Morgan in Morocco Physical characteristics: Physical: One piece covered by thin black fusion crust with signs of weathering Petrography: (Y. Liu, JPL) Light-gray stone consists of subophitic assembly of fine-grained plagioclase and pyroxene. Large anhedral pyroxene and plagioclase grains are also present, forming locally porphyritic texture. Accessory phases include silica phase, troilite, ilmenite and chromite. Geochemistry: Low-Ca pyroxene (Fs60-59Wo2-4, FeO/MnO=30-34) contains pigeonite lamellae (Fs25-29Wo45-40, FeO/MnO=31-34) or vise versa; Plagioclase (An90.7±1.2, n=20). Classification: Eucrite Specimens: 20.9 g at UCLA. The remainder is held by by MtMorgan.
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-mmict
Country
Year found
2016
Mass
1424 g
[Museum Collection]
(1) 4.5g
History: Purchased by Eric Twelker in October 2016 from a dealer in Agadir, Morocco. Petrography: (A. Irving and S. Kuehner, UWS) Monomict breccia composed of clasts with intersertal texture. Minerals are exsolved pigeonite, calcic plagioclase, silica polymorph, ilmenite, Ti-bearing chromite and troilite. Geochemistry: Orthopyroxene host (Fs62.1-63.2Wo1.8-2.1, FeO/MnO = 31-38, N = 3), clinopyroxene exsolution lamellae (Fs25.4-27.4Wo45.2-43.6, FeO/MnO = 34-37, N =3), plagioclase (An89.0-90.6Or0.9-1.2, N = 2). Classification: Eucrite (monomict breccia). Specimens: 22 g plus one polished thin section at UWB; remainder with Mr. E. Twelker.
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-unbr
Country
Year found
2017
Mass
830 g
[Museum Collection]
(1) 3.7g (2) 4.3g (3) 4.0g
History: Purchased by Eric Twelker in January 2017 from a Moroccan dealer at the Tucson Gem and Mineral Show. Petrography: (A. Irving and S. Kuehner, UWS) Medium grained (average 0.5 mm) with equigranular texture, and composed predominantly of exsolved pigeonite and calcic plagioclase with accessory silica polymorph, ilmenite (with rutile exsolution lamellae), chromite and stained Ni-free metal. Geochemistry: Orthopyroxene host (Fs60.0-60.3Wo1.9-1.8, FeO/MnO = 30, N = 3), clinopyroxene exsolution lamellae (Fs26.8-27.8Wo42.1-40.7, FeO/MnO = 29-33, N =3), plagioclase (An89.3-90.3Or0.0-0.6, N = 3). Classification: Eucrite (unbrecciated, microgabbroic). Specimens: 22.5 g plus one polished thin section at UWB; remainder with Mr. E. Twelker.
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-melt breccia
Country
Year found
2016
Mass
650 g
[Museum Collection]
(1) 6.87g
History: The meteorite was bought from a local meteorite dealer in Quarzazate, Morocco. Physical characteristics: Brownish individual without fusion crust. Petrography: The meteorite is a melt breccia composed of up to 5 mm sized basaltic clasts set into shock melted matrix. Basaltic clasts consist of exsolved pyroxenes and often lath shaped calcic plagioclase. The shock melt is mostly recrystallized to plagioclase and pyroxene; some regions show pronounced flow textures. Minor phases include silica, chromite, ilmenite and barite. Geochemistry: low-Ca pyroxene: Fs59.9±0.9Wo4.0±1.3 (Fs57.4-61.1Wo2.2-7.6, n=14, FeO/MnO=33-37); Ca-pyroxene: Fs27.8±1.2Wo42.1±1.2 (Fs26.2-30.1Wo39.7-43.8, n=16, FeO/MnO=33-39); calcic plagioclase: An90.6±0.8 (An89.3-91.9, n=16)
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-br
Country
Year found
2019
Mass
7.84 kg
[Museum Collection]
(1) 5.9g (2) 7.2g (3) 8.8g
History: Purchased by Mark Lyon in November 2019 from a Moroccan dealer. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of texturally diverse eucrite clasts (up to 2.8 cm across) exhibiting gabbroic, diabasic, granulitic and partially recrystallized textures set within a fragmental matrix of related crystalline debris. Major minerals are low-Ca pyroxene, augite and calcic plagioclase, together with accessory silica polymorph, Ti-Al-bearing chromite, ilmenite, troilite and Ni-free iron metal. In coarser grained gabbroic and diabasic clasts low-Ca and high-Ca pyroxenes are in exsolution relationship and represent former pigeonite, but in granulitic and recrystallized clasts both pyroxenes are present as discrete grains. In partially recrystallized clasts pyroxene is finely polygranular but plagioclase is not. Geochemistry: Low-Ca pyroxene (Fs56.8-58.3Wo4.8-7.0, FeO/MnO = 29-31, N = 5), augite (Fs28.9-30.2Wo40.1-41.0, FeO/MnO = 31-34, N = 5), plagioclase (An88.4-90.0Or0.8-0.5, N = 5). Classification: Eucrite (genomict breccia). Specimens: 212 g including one large polished thin section at UWB; remainder with Mr. M. Lyon.
Name
*click on the Name for more information
Structure Class
Chemical Class
Eucrite-melt breccia
Country
Year found
2020
Mass
29.4 kg
[Museum Collection]
(1) 19.1g
History: Two identical stones of 19200 g and 10200 g were purchased in June 2020 by Aziz Habibi from a Mauritanian dealer. The larger stone was subsequently acquired by Marcin Cimala. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Monomict breccia composed of angular eucrite clasts with intergranular texture in a fairly sparse melt rock matrix (dark gray in thin section) containing entrained crystalline debris. Minerals are exsolved pigeonite, calcic plagioclase, silica polymorph, chromite (some grains compositionally zoned), ilmenite, troilite and Ni-free Fe metal. Some thin dark shock veinlets crosscut clasts, and secondary calcite is present as veins and also infilling cavities in the matrix. Geochemistry: Low-Ca pyroxene host (Fs58.7-60.7Wo2.3-4.4, FeO/MnO = 30-32, N = 4), augite exsolution lamellae (Fs25.7-26.8Wo42.6-43.6, FeO/MnO = 31-32, N = 4), plagioclase (An88.1-90.1Or0.5-0.3, N = 4). Classification: Eucrite (monomict melt-matrix breccia). Specimens: 29 g including one polished thin section at UWB; remaining material held by Mr. M. Cimala (10900 g) and Mr. A. Habibi (10170 g).
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-unbr
Country
Year found
2020
Mass
14 kg
[Museum Collection]
(1) 17.1g
History: Purchased January, 2020, by Mark Lyon from a Northwest African dealer Physical characteristics: Single stone with black fusion crust. Interior shows unbrecciated texture with millimeter-sized dark green pyroxenes and white plagioclase crystals. Cut and broken surfaces shows equigranular, medium grained, basaltic texture. Petrography: (A. Ross, UNM; D. Dickens, NMMS; C. Agee, UNM) Microprobe examination of a polished mount shows approximately equal amounts of pyroxene and plagioclase grains often in poikiloblastic arrangement. Some pyroxenes have exsolution. Ubiquitous silica, ilmenite, and troilite. No metal was observed. Geochemistry: (A. Ross, UNM) Low-Ca pyroxene Fs61.7±0.2Wo1.8±0.2, Fe/Mn=33±1, n=7; high-Ca pyroxene Fs29.5±5.0Wo40.0±5.8, Fe/Mn=32±2, n=5; plagioclase An84.7±4.3, n=7; Classification: Achondrite (equilibrated unbrecciated eucrite). Equilibration and clear compositional separation of low-calcium and high-calcium pyroxenes is consistent with type 6 eucrites. Specimens: 28.6 g including a probe mount on deposit at UNM, Mark Lyon holds the main mass.
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-melt breccia
Country
Year found
2022
Mass
564 g
[Museum Collection]
(1) 13.06g
History: The meteorite was purchased from a meteorite dealer in Morocco. Physical characteristics: Grayish rock without fusion crust. Petrography: Eucrite-melt breccia composed of up to 1.5 cm basaltic clasts and up to 0.3 mm sized mineral fragments in fine-grained and mostly recrystallized shock melted matrix. Main minerals are exsolved pyroxenes and calcic plagioclase. Mineral grains entrained in the melt matrix often show resorption textures. Minor phases include silica, chromite, ilmenite, and FeS. No metallic iron has been detected. Contains secondary calcite veins and barite. Geochemistry: low-Ca pyroxene: Fs60.1±0.8Wo2.3±0.1 (Fs59.4-60.5Wo2.1-2.5, FeO/MnO=29-30, n=7); augite exsolution lamellae: Fs24.9±0.2Wo44.5±0.4 (Fs24.5-25.1Wo44.2-45.4, FeO/MnO=28-32, n=7); calcic plagioclase: An90.2±0.9 (An89.6-91.7, n=7)
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-pmict
Country
Year found
2021
Mass
700 g
[Museum Collection]
(1) 3.8g
History: Purchased by Craig Zlimen from an Algerian meteorite dealer in October 2021. Physical characteristics: A sawcut surface reveals this meteorite to be a breccia with scattered fragments of light and brown colored clasts set in dark gray matrix. Petrography: (C. Agee, UNM) Electron microprobe analysis and reflected light microscopy of a polished mount show this meteorite to be a polymict breccia of ~70% cumulate eucrite and ~30% basaltic eucrite. Most plagioclase appears to be maskelynitized. Minor amounts of ilmenite, troilite, chromite (aluminous), silica, and low-Ni Fe-metal were detected. Geochemistry: (A. Ross, UNM) Cumulate eucrite low-Ca pyroxene Fs35.9±2.7Wo2.1±0.4, Fe/Mn=29±1, n=7; cumulate eucrite augite Fs15.1±0.3Wo44.2±0.5, Fe/Mn=24±2, n=3; basaltic eucrite low-Ca pyroxene Fs65.6±3.7Wo2.6±0.9, Fe/Mn=33±1, n=3; plagioclase An92.6±0.2, n=6. Classification: Polymict eucrite Specimens: 26 g on deposit at UNM, Craig Zlimen holds the main mass.
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-melt breccia
Country
Year found
2022
Mass
5.85 kg
[Museum Collection]
(1) 86.30g
History: The meteorite was purchased from a meteorite dealer in Morocco. Physical characteristics: Dark grayish rock with some fusion crust. Petrography: Eucrite-melt breccia composed of up to 3 cm sized basaltic clasts and up to 500 µm sized mineral fragments in black shock melted matrix. Main minerals are exsolved pyroxenes and calcic plagioclase. The shock melt is mostly finely recrystallized and partly displays flow textures. Mineral grains entrained in the melt matrix often show resorption textures. Minor phases include silica, chromite, ilmenite, and FeS. No metallic iron detected. Geochemistry: low-Ca pyroxene: Fs62.5±0.6Wo2.6±0.8 (Fs61.3-63.6Wo1.9-4.6, FeO/MnO=27-30, n=10); high-Ca pyroxene: Fs27.6±0.7Wo43.6±0.7 (Fs26.3-28.7Wo42.2-44.9, FeO/MnO=27-32, n=10); calcic plagioclase: An87.1±1.0 (An85.4-88.9, n=10).
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-melt breccia
Country
Year found
2022
Mass
105 kg
[Museum Collection]
(1) 154.13g (2) 109g
History: Mark Lyon purchased 105 kg of similar looking fusion crusted achondritic meteorites from a meteorite dealer in Mauritania in 2022/2023. The largest stone is 12 kg. A 433.7 g stone was donated to the Buseck Center for Meteorite Studies at ASU. Physical characteristics: A fresh, fusion crusted angular stone with poorly developed regmaglypts. Fusion crust is locally glossy with well developed flow patterns. Sawn surface (7 × 5 cm) shows coarse breccia of light-colored rounded breccia clasts separated by dark vesicular melt veins with a matte-black appearance. Clasts are poorly sorted and range considerably in size, many measuring several centimeters. Petrography: (E. Mares, S. Ravikumar, L. Garvie, A. Wittmann, ASU) Eucrite-melt breccia with clasts to 5 cm with a distinct boundary to the black melt veins. Predominant minerals are up to 1-mm-sized exsolved pyroxenes and calcic plagioclase that exhibit gabbroic cumulate textures. All clasts appear similar in their modal mineralogies, suggesting the sample is a monomict breccia. Accessory phases include ilmenite, chromite, troilite, silica, F-rich Ca phosphate, Ca-Fe-Mg phosphate, and zircon. Small grains of ilmenite and chromite are present as inclusions within the pyroxene-plagioclase clasts. Troilite is primarily encountered as small rounded blebs within the melt veins. No metallic Fe-Ni detected. Geochemistry: Low-Ca pyroxene: Fs 61.9±1.1Wo2.6±0.9, FeO/MnO=31.71±0.89, n=10; augite: Fs27.7±0.9Wo42.9±0.9, FeO/MnO=33.33±1.35, n=10; Calcic plagioclase: An96.2±1.0Ab3.1±0.2, n=10. Silica contains 0.11±0.01 wt% Al, 0.24±0.12 wt% Fe and up to 0.1 wt% K (n=10). Chromite has variable Ti content (ranges from 1.3-9.1 wt% Ti; n = 4). Ilmenite is close to stoichiometric FeTiO3 with trace Mg, Mn, and Cr. Classification: This meteorite is a gabbroic monomict eucrite impact breccia. Specimens: One specimen (433.7 g) in the ASU Buseck Center for Meteorite Studies.
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite
Country
Year found
2023
Mass
12 kg
[Museum Collection]
(1) 21.48g
History: The meteorite was purchased from a meteorite dealer in Algeria. Physical characteristics: Light grayish rock partly covered with fusion crust. Petrography: Unbrecciated eucrite showing a thoroughly recrystallized equigranular texture of predominantly low-Ca pyroxene, Ca-pyroxene, and calcic plagioclase grains often meeting at 120 degree grain boundaries. Low-Ca pyroxenes contain fine augite exsolution lamellae and vice versa. Minor phases include silica, chromite, ilmenite, FeS, and Ni-free metal. Geochemistry: low-Ca pyroxene: Fs57.8±0.1Wo5.0±0.1 (Fs57.7-57.9Wo4.8-5.1, FeO/MnO=28-30, n=5); Ca-pyroxene: Fs29.5±0.2Wo40.5±0.2 (Fs29.2-29.7Wo40.4-40.7, FeO/MnO=27-30, n=5); calcic plagioclase: An88.6±0.3 (An88.1-89.0, n=5)
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite
Country
Year found
2023
Mass
1050 g
[Museum Collection]
(1) 27.28g
History: The meteorite was purchased from a meteorite dealer in Libya. Physical characteristics: Brownish rock with minor fusion crust. Petrography: Achondritic breccia composed of fine-grained up to 2 mm sized angular to subrounded clasts set in more coarse-grained matrix, both showing metamorphic textures with some triple junction between adjoining minerals. Dominant phases in both lithologies are low-Ca pyroxene, Ca-pyroxene, and calcic plagioclase with grain sizes up to 80 µm in clasts and up to 300 µm in the matrix. Low Ca-pyroxenes are often exsolved in the matrix but not in the clasts and both, low-Ca pyroxene and Ca-pyroxene are more ferroan in the matrix compared to those in the clasts. Minor phases include ilmenite, chromite, FeS, and FeNi metal. Geochemistry: fine-grained clasts: low-Ca pyroxene Fs46.9±0.2Wo2.6±0.2??(Fs46.7-47.3Wo2.3-2.8, FeO/MnO=31-34, n=7); Ca-pyroxene: Fs20.7±0.2Wo43.2±0.2??(Fs20.4-20.9Wo43.0-43.4, FeO/MnO=29-32, n=7); calcic plagioclase: An92.7±0.95??(An91.3-93.7, n=7); coarse-grained matrix: low-Ca pyroxene: Fs55.5±0.5Wo3.0±0.2??(Fs54.6-56.1Wo2.6-3.2, FeO/MnO=32-35, n=7); Ca-pyroxene: Fs26.4±0.3Wo42.3±0.3??(Fs26.1-27.2Wo41.9-42.7, FeO/MnO=30-33, n=7); calcic plagioclase: An90.6±1.6??(An88.1-91.9, n=7).
Name
*click on the Name for more information
Structure Class
HED achondrites
Chemical Class
Eucrite-melt breccia
Country
Year found
2024
Mass
5.2 kg
[Museum Collection]
(1) 198.90 g
History: The meteorite was purchased from a meteorite dealer in Libya. Physical characteristics: Grayish fragment partly covered with fusion crust. Petrography: Achondritic melt-breccia composed of up to 2.5 mostly angular to subrounded bulk rock clasts predominantly consisting of finely recrystallized calcic plagioclase and often exsolved pyroxenes set in abundant black melt rock matrix. Mineral grains often show resorption textures where in contact with the melt zones. Minor phases include silica, chromite, ilmenite, and FeS. No metallic iron detected. Geochemistry: low-Ca pyroxene: Fs57.0±0.6Wo3.7±0.6 (Fs56.0-57.4Wo2.9-4.5, FeO/MnO=28-31, n=7); Ca-pyroxene: Fs29.3±0.9Wo40.3±0.8 (Fs27.2-30.0Wo38.9-41.2, FeO/MnO=29-35, n=7); calcic plagioclase: An90.8±1.1 (An89.1-92.5, n=7)