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Northwest Africa 15200 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 15200 This is an OFFICIAL meteorite name. Abbreviation: NWA 15200 Observed fall: No Year found: 2022 Country: Algeria Mass: 196 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 32 approved meteorites classified as Martian (nakhlite). [show all] Search for other: Martian meteorites | ||||||||||||||||||||||||||||
Comments: | Approved 5 Sep 2022 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 111:
Northwest Africa 15200 (NWA 15200) Algeria Purchased: 2022 Classification: Martian meteorite (Nakhlite) History: Purchased from Jaoud Chaoui in 2022. Physical characteristics: Exterior covered in dark fusion crust. Broken surface shows a mix of green, orange-brown, and cream-colored grains. Friable. Petrography: (A. Ross and C. Agee, UNM) This meteorite is an augite-rich cumulate rock with ferro-hypersthene, fayalitic olivine, andesine plagioclase, Al-K-rich mesostasis, Ti-Cr magnetite, ilmenite, and troilite. Augite grains can be more than millimeter in size, as are the olivine grains. Augite is weakly zoned. Ferro-hypersthene commonly occurs as a separate phase, but also as ferroan rims on some augite grains. Olivines are relatively uniform in composition with no igneous zoning present. Plagioclase and mesostasis typically occupy interstitial spaces between larger pyroxene and olivine grains. Maskelynite is absent. Geochemistry: (A. Ross and C. Agee, UNM) Olivine Fa71.8±1.2, Fe/Mn=49±1, CaO=0.42±0.05, (wt%), n=10; augite Fs28.8±5.5Wo38.5±1.7, Fe/Mn=35±1, n=13; ferro-hypersthene Fs57.4±0.8Wo3.0±4.5, Fe/Mn=36±2, n=7; plagioclase An35.7±2.4Ab60.9±2.0, n=10; mesostasis SiO2=60.0±2.7, Al2O3=16.0±1.1, TiO2=1.0±0.7, FeO=8.0±2.9, CaO=0.8±0.3, Na2O=2.1±0.4, K2O=8.9±2.1 (all wt%), n=6. Classification: Martian nakhlite. Pyroxene compositions in this nakhlite are similar to those in NWA 998, however they are not paired, as NWA 998 lacks significant mesostasis (Treiman, 2005). Specimens: 21.4 g on deposit at UNM, Mark Lyon holds the main mass which is a 24 g fragment plus another 50 g in smaller fragments, Topher Spinnato and Sean Mahoney also hold approximately 50 g each in smaller fragments. | ||||||||||||||||||||||||||||
Bibliography: |
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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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Photos: |
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Geography: |
Statistics: This is 1 of 1344 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||||||||
Crosslinks: |
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Revision history: |
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