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Northwest Africa 15156 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 15156 This is an OFFICIAL meteorite name. Abbreviation: NWA 15156 Observed fall: No Year found: 2022 Country: Algeria Mass: 191 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 319 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all] Search for other: Martian meteorites | ||||||||||||||||||||||||||||
Comments: | Approved 6 Aug 2022 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 111:
Northwest Africa 15156 (NWA 15156) Algeria Purchased: 2022 Classification: Martian meteorite (Shergottite) History: Purchased from a North African meteorite dealer in 2022. Physical characteristics: Sand blasted exterior with no fusion crust, a polished saw cut reveals dark brown, high relief olivine phenocrysts set in a fine-grained light gray groundmass. Small shiny maskelynite grains are macroscopically visible. Petrography: (A. Ross and C. Agee, UNM) This meteorite has the approximate modal abundances: 55% pigeonite, 20% olivine, 10% maskelynite, with accessory ilmenite, chromite, Ti-Cr spinel, titanomagnetite, low Ni Fe-metal, and troilite. Pigeonite shows a correlated calcium-iron enrichment trend. Olivine phenocrysts show a wide compositional range due to zoning. Maskelynite is usually observed occupying pyroxene and olivine grain boundary pockets. Geochemistry: (A. Ross, UNM) Olivine Fa38.2±17.0, Fe/Mn=53±4, CaO=0.27±0.06, (wt%), n=7; pyroxene Fs28.9±3.3Wo11.7±4.5, Fe/Mn=30±2, n=12; maskelynite An62.2±1.6Ab37.3±1.3Or0.5±0.3, n=4. Classification: Martian shergottite (olivine phyric basalt). Specimens: 20.25 g on deposit at UNM, Mark Lyon holds the main mass. | ||||||||||||||||||||||||||||
Data from: MB111 Table 0 Line 0: |
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Institutions and collections |
UNM: Institute of Meteoritics
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126
USA, United States; Website (institutional address; updated 12 Feb 2015) |
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Catalogs: |
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References: | Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Geography: |
Statistics: This is 1 of 1344 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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