Shergottites
Name
*click on the Name for more information
Structure Class
achondrites
Chemical Class
Martian (shergottite)
Country
Year found
2018
Mass
3.29 kg
[Museum Collection]
(1) 2.79g (2) 1.26g
History: Purchased in Ouarzazate, Morocco by Mohamed Aid in July 2018. Petrography: (A. Irving and S. Kuehner, UWS; P. Carpenter, WUSL) Medium-grained with diabasic texture and some small, dark glassy shock melt pockets. Composed predominantly of zoned clinopyroxene and maskelynite with accessory fine grained intergrowths of hedenbergite+fayalite+silica, Fe-Ti oxide (finely exsolved), merrillite and pyrrhotite. Geochemistry: Subcalcic augite (Fs28.5-30.6Wo28.2-23.7, FeO/MnO = 30, N = 2), pigeonite (Fs41.3Wo15.5, FeO/MnO = 31), ferropigeonite (Fs71.1-83.4Wo17.1-11.3, FeO/MnO = 38-45, N = 4), maskelynite (An50.9-52.1Or2.1, N = 2). Classification: Martian (shergottite, diabasic) Specimens: 26.3 g including one polished thin section at UWB; remainder with Aaronson.
Name
*click on the Name for more information
Structure Class
achondrites
Chemical Class
Martian (shergottite)
Country
Year found
2018
Mass
1679 g
[Museum Collection]
(1) 7.02g (2) 1.34g
History: Purchased in Ouarzazate, Morocco by Mohamed Aid in July 2018. Petrography: (A. Irving and S. Kuehner, UWS; P. Carpenter, WUSL) Relatively fine grained with intersertal texture. Composed predominantly of zoned clinopyroxene and maskelynite (some exhibiting a curved, narrow lath-like habit) with accessory fine grained intergrowths of hedenbergite+fayalite+silica, Fe-Ti oxides, merrillite and pyrrhotite. Geochemistry: Subcalcic augite (Fs24.8-41.8Wo31.4-24.3, FeO/MnO = 30-33, N = 3), ferropigeonite (Fs66.9-73.0Wo16.6-16.5, FeO/MnO = 41-43, N = 2), maskelynite (An51.9-53.1Or1.3-1.2, N = 2). Classification: Martian (shergottite, fine-intersertal) Specimens: 20.5 g including one polished thin section at UWB; remainder with Mr. Aaronson.
Name
*click on the Name for more information
Structure Class
achondrites
Chemical Class
Martian (shergottite)
Country
Year found
2018
Mass
150 g
[Museum Collection]
(1) 9.59g (2) 0.97g (3) 0.82g
History: Found in Algeria in 2018 and purchased from a Moroccan dealer by Huapei Wang in 2018 Physical characteristics: These stones are (partially) covered by black fusion crust and appear to be very fresh and unaltered. Numerous vesicles are seen in the fusion crust. The interior is composed of yellow green grains with interstitial pale gray grains. Petrography: The rock has a medium-grained subophitic texture. It consists of elongated prismatic pyroxene (up to 1.5 mm in length) and lath-like plagioclase (up to 1.8 mm in length), with accessory titanomagnetite, ilmenite, silica polymorph, merrillite, pyrrhotite, fayalite. Pyroxenes show patchy zoning from Mg-rich core to Mg-poor rim, with irregular boundaries. Ilmenite occurs as thin lamellae intergrown with titanomagnetite. Geochemistry: Pyroxenes are zoned from augite cores (En45.3Wo25.6, FeO/MnO = 28.5) and pigeonite cores (En40.3Wo19.6 FeO/MnO = 32.3) to ferropigeonite rims (En8.4Wo14.5 FeO/MnO = 41.1). Plagioclase is characterized by homogeneous compositions of An52 Or1.4. Titanomagnetite (TiO2 29.4 wt%, FeO 65.5 wt%, Al2O3 1.3 wt%); ilmenite (TiO2 48.9 wt%, FeO 49.8 wt%).
Name
*click on the Name for more information
Structure Class
achondrites
Chemical Class
Martian (shergottite)
Country
Year found
2020
Mass
346 g
[Museum Collection]
(1)20.529g (2)10.515g (3)4.461g (4)3.613g
(5)3.609g (6)3.178g (7)3.144g (8)2.531g
(9)2.445g (10)1.982g (11)1.860g (12)1.562g
(13)1.544g (14)1.468g (15)1.408g (16)1.399g
(17)1.288g (18)1.275g (19)1.260g (20)1.110g
(21)1.024g (22)0.879g (23)0.858g (24)0.853g
(25)0.795g (26)0.730g (27)0.717g (28)0.711g
(29)0.699g (30)0.608g (31)0.566g (32)0.517g
(33)0.497g (34)0.462g (35)0.451g (36)0.446g
(37)0.424g
History: Purchased by Eric Twelker in February 2020 from a Moroccan dealer at the Tucson Gem and Mineral Show. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Diabasic texture (mean grainsize ~0.8 mm). Composed predominantly of prismatic grains of zoned clinopyroxene and lath-like maskelynite together with accessory silica polymorph, merrillite, chlorapatite, Cr-Mn-bearing ulvöspinel, ilmenite, pyrrhotite and baddeleyite. Minor secondary calcite is present. Geochemistry: Subcalcic augite (Fs20.1-27.3Wo29.1-35.4, FeO/MnO = 19-34 , N = 5), ferroan subcalcic augite rim (Fs45.1Wo30.7, FeO/MnO = 36), ferroan pigeonite rims (Fs53.9-61.3Wo13.4-15.7, FeO/MnO = 36-37, N = 3), maskelynite (An53.4-55.7Or1.4-0.9, N = 4). Classification: Shergottite (diabasic). Specimens: 20.5 g plus one polished thin section at UWB; remainder with Mr. E. Twelker.
Name
*click on the Name for more information
Structure Class
achondrites
Chemical Class
Martian (shergottite)
Country
Year found
2020
Mass
249 g
[Museum Collection]
(1) 5.50g
History: Purchased from a Moroccan dealer in April 2020. Physical characteristics: Single stone, fusion crust, saw cuts reveals an ultramafic cumulate rock with ophitic to poikilitic textures with mm-size pale yellow and dark gray grains. Petrography: (C. Agee, UNM) Microprobe examination shows approximately 50% olivine, 40% pyroxene, and 10-5% maskelynite. Two distinct pyroxene trends are present 1) Mg-rich low calcium pyroxene trending to slightly more Fe-rich pigeonite, 2) Mg-rich augite trending to more Ca-rich augite. Ilmenite, spinel, Fe-sulfide, and merrillite are minor ubiquitous phases. Geochemistry: (C. Agee, UNM) Olivine Fa34.6±2.0, Fe/Mn=49±2, n=10; low Ca-pyroxene Fs22.5±0.5Wo4.7±0.7, Fe/Mn=29±2, n=6; augite Fs17.2±0.9Wo32.4±2.8, Fe/Mn=24±1, n=4; maskelynite An52.9±2.3Ab46.0±2.2Or1.1±0.2, n=4, fusion crust SiO2=46.5±0.6, TiO2=0.9±0.1, Al2O3=8.6±3.5, Cr2O3=0.7±0.1, MgO=18.0±3.5, FeO=15.3±0.5, MnO=0.4±0.1, Na2O=1.4±0.5 (all wt%), n=2. Classification: Martian peridotitic shergottite. Macroscopic textural appearance similar to NWA 1950 and ALHA77005. Paired with NWA 13250. Specimens: 20 g on deposit at UNM, Marcin Cimala holds the main mass.
Name
*click on the Name for more information
Structure Class
achondrites
Chemical Class
Martian (shergottite)
Country
Year found
2023
Mass
339 g
[Museum Collection]
(1) 5.25g (2) 2.57g
History: The meteorite was purchased from a meteorite dealer in Morocco. Physical characteristics: Grayish to dark greenish fragments with patches of black fusion crust. Petrography: The meteorite shows a poikilitic texture of up to 3 mm sized pyroxenes enclosing rounded to subrounded olivines that frequently contain trapped melt inclusions. Feldspar is a minor component and has completely been transformed to maskelynite. Accessory minerals include chomite, FeS and FeNiS. Contains glassy to finely recrystallized shock melt pocket. Geochemistry: olivine: Fa27.8±0.7 (Fa26.8-28.4, FeO/MnO=44±1, n=10); orthopyroxene: Fs18.7±0.3Wo2.4±0.1 (Fs18.3-19.5Wo2.3-2.6, FeO/MnO=27±2, n=10); pigeonite: Fs24.6±1.5Wo10.6±2.3 (Fs20.4-26.6Wo7.1-13.7, FeO/MnO=26±1, n=10); maskelynite (An53.2-56.3Ab42.4-45.4Or1.3-1.5, n=10) Classification: Martian meteorite (shergottite); likely paired with NWA 10961