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Northwest Africa 13638 | |||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13638 This is an OFFICIAL meteorite name. Abbreviation: NWA 13638 Observed fall: No Year found: 2020 Country: Algeria Mass: 512 g | ||||||||||||||||||||||
Classification history: |
This is 1 of 334 approved meteorites classified as Lunar (feldsp. breccia). [show all] Search for other: Lunar meteorites | ||||||||||||||||||||||
Comments: | Approved 18 Jan 2021 | ||||||||||||||||||||||
Writeup |
Writeup from MB 110:
Northwest Africa 13638 (NWA 13638) Algeria Find: 2020 Classification: Lunar meteorite (feldspathic breccia) Physical characteristics: Physical: Single stone, weathered exterior without fusion crust; Cut surfaces reveal >25 vol% angular rock and mineral clasts in a black matrix Petrography: (Y. Liu, JPL) Polished thick sections were observed using EMP and SEM. Rock clasts include angular fragments of basalts, anorthosite, and breccias. Graphic granite fragments are present, that contain a silica phase, orthoclase, zirconolite, tranquillityite, and apatite. Mineral fragments are mostly pyroxene and plagioclase with minor amounts of olivine and trace amounts of silica phases and apatite. Matrix is glassy and black. Terrestrial weathering in the form of carbonate in fractures, but no alteration rims on metals and sulfides. Geochemistry: Mineral compositions (Y. Liu, JPL): Olivine, 55.4 ±24.0 (Fa96-33, molar Fe/Mn 94±16, n=9); Low-Ca pyroxene, Fs42.0±5.7Wo2.5±0.5 (Fs38-46Wo2-3, Fe/Mn 47±1, n =2); Pigeonite, Fs37.1±10.5Wo11.3±3.1 (Fs28-69Wo5-15, Fe/Mn=62.5±5.5, n=16), High-Ca pyroxene, Fs43.0±15.8Wo26.7±7.5 (Fs20-73Wo16-37, Fe/Mn=65.6±8.6, n = 37); Plagioclase, An91.8±4.5Ab7.5±4.2 (An83-99Ab1-16, n =23). Classification: Achondrite (Lunar polymict melt breccia) Specimens: 20 g at UCLA (A Rubin). The remainder is held by MtMorgan at Mile High Meteorites. | ||||||||||||||||||||||
Data from: MB110 Table 0 Line 0: |
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Institutions and collections |
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011) MtMorgan: Matt Morgan, Mile High Meteorites, P.O. Box 151293, Lakewood, CO 80215-9293, United States; Website (private address) |
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Catalogs: |
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References: | Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Geography: |
Statistics: This is 1 of 1336 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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