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Basaltic

El Hareicha 001

Name

*click on the Name for more information

Structure Class

achondrites

Chemical Class

Lunar (bas/gab brec)

Country

Year found

2022

Mass

365 g

[Museum Collection]

(1) 49.82g   (2) 9.76g   (3) 6.61g   (4) 4.10g

(5) 3.76g   (6) 1.09g   (7) 8.57g   (8) 7.13g

(9) 6.21g   (10) 6.20g   (11) 5.73g   (12) 4.98g

(13) 1.58g   (14) 3.86g   (15) 2.02g   (16) 3.514g

History: The individual was found by meteorite hunters in northern Mali close to the border to Mauritania and subsequently purchased by the main mass holder from a Morrocan dealer. Physical characteristics: Grayish rock without fusion crust. Petrography: The meteorite displays a light grayish interior and is a polymict breccia predominantly composed of up to 7 mm sized basaltic and gabbroic clasts as well as mineral fragments set in a fine-grained partly shock melted matrix. Dominant minerals are olivine, esxolved pyroxene, zoned pyroxene, pigeonite, augite, and calcic plagioclase. Minor phases include ferroan pigeonite, fayalite, ilmenite, and FeS. Contains secondary barite and calcite filled veins. Geochemistry: olivine: Fa30.4±0.4 (Fa29.7-30.7, FeO/MnO=93±8, n=7); low-Ca pyroxene host to augite exsolution lamellae: Fs50.8±0.2Wo2.5±0.1 (Fs50.5-51.1Wo2.4-2.6, FeO/MnO=65±3, n=4); augite exsolution lamellae: Fs23.4±0.2Wo40.4±0.1 (Fs23.2-23.6Wo40.2-40.5, FeO/MnO=66±3, n=4); augite: Fs9.1±0.2Wo44.0±0.5 (Fs8.8-9.3Wo43.1-44.6, FeO/MnO=32±3, n=7); subcalcic augite: Fs37.2±1.4Wo25.7±0.8 (Fs36.4-40.7Wo23.8-26.1, FeO/MnO=75±5, n=7); ferroan pigeonite: Fs84.5±2.5Wo12.9±2.1 (Fs80.0-86.7Wo10.8-16.8, FeO/MnO=88±4, n=5); zoned pyroxene: Fs36.4±11.3Wo22.1±8.4 (Fs23.9-52.8Wo5.5-28.6, FeO/MnO=75±10, n=7); calcic plagioclase: An96.2±0.5 (An95.5-97.0, n=10) Classification: Lunar polymict breccia

NWA2727

Name

*click on the Name for more information

Structure Class

achondrites

Chemical Class

Lunar (bas/gab brec)

Country

Year found

2005

Mass

191.2 g

[Museum Collection]

(1) 0.96g   (2) 0.04g  

History: Four stones of 30.6 g, 11.6 g, 64 g, and 85 g were purchased from Moroccan dealers in Erfoud for a consortium of North American collectors in June and July of 2005. Petrography and Geochemistry: (T. Bunch and J. Wittke, NAU; A. Irving and S. Kuehner, UWS; R. Korotev, WUSL) All stones are very similar and consist of clast-dominated polymict breccias composed of >80 vol% olivine-phyric basalt and gabbroic/diabasic clasts (0.2 cm to several cm across) within a finer breccia matrix. The basalt clasts show a wide range in mineral compositions, but all contain phenocrysts of olivine (Fa28–99; FeO/MnO = 98.9) and some also have phenocrysts of pyroxferroite or chromite all in a fine-grained matrix consisting of intergrown pigeonite, pyroxferroite, K-Ba feldspar, ilmenite, merrillite, baddeleyite, troilite, silica, and glass. The gabbroic clasts range in texture from coarser-grained (>3 mm) hypidiomorphic gabbro to finer-grained (~1 mm) diabasic clasts. Both types of gabbroic lithologies consist mainly of pigeonite (Fs23.3–31.3Wo8.7–11.5; FeO/MnO = 60–69) and subhedral to anhedral olivine (Fa34.1–41; FeO/MnO = 85– 99) with less abundant augite (Fs24.1–47.5Wo24.4–32.1) and partly maskelynite, blocky to tabular plagioclase (An81–94). The breccia matrix consists mainly of gabbroic debris with fragments of basalt, silica polymorph, symplectites, subparallel intergrowths of anorthite + pyroxferroite + ilmenite and shock-melted material. Bulk compositions: (R. Korotev, WUSL) INAA of 11 subsamples show that they vary considerably in bulk composition, with the most Fe-rich subsample nearly indistinguishable from NWA 3160 basalt. All other subsamples are compositionally equivalent to mixtures of NWA 3160 basalt and the regolith breccia lithology of NWA 773, but with slightly lower concentrations of incompatible elements. Note: Based on petrography, mineral compositions, and bulk compositions, these stones are paired with NWA 3160 and may be paired with NWA 773. Classification: Achondrite (lunar, mare basalt/gabbro breccia). Specimens: A 20.2 g type specimen and two polished thin sections are on deposit at NAU. A 0.5 g type specimen is on deposit at WUSL. Oakes, Reed, Boswell, and Turecki hold the main masses.

NWA14188

Name

*click on the Name for more information

Structure Class

achondrites

Chemical Class

Lunar (bas. breccia)

Country

Year found

2021

Mass

260 g

[Museum Collection]

(1) 8.90g   (2) 1.198g  

History: Found in Niger and purchased by Craig Zlimen in February 2021 from an Algerian dealer. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of basaltic lithic clasts and related crystalline debris (predominantly olivine, pigeonite, subcalcic augite and anorthite) in a finer grained matrix. Accessory phases are Ti-chromite, troilite, kamacite (fresh to partly altered) and minor secondary barite. Geochemistry: Olivine (Fa37.1-39.1, FeO/MnO = 102-117, N = 4), pigeonite (Fs26.1-28.0Wo9.4-11.4; Fs24.6Wo18.8; FeO/MnO = 56-62; N = 3), subcalcic augite (Fs21.4Wo25.0, FeO/MnO = 55), anorthite (An95.4-95.6Or0.3-0.2, N = 3). Classification: Lunar (basaltic breccia). Specimens: 20.0 g including one polished endcut at UWB; remainder with Mr. C. Zlimen.

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