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Northwest Africa 14899 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 14899 This is an OFFICIAL meteorite name. Abbreviation: NWA 14899 Observed fall: No Year found: 2022 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 307 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all] Search for other: Martian meteorites | ||||||||||||||||||||||||||||||
Comments: | Approved 9 May 2022 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 111:
Northwest Africa 14899 (NWA 14899) (Northwest Africa) Purchased: 13 March 2022 Classification: Martian meteorite (Shergottite) History: Purchased on March 13, 2022. by Matthew Stream from Bachir Salek in Algeria. Physical characteristics: Five stones with slightly weathered fusion crust. Petrography: (D. Sheikh, Cascadia) Sample displays a gabbroic texture (Av. silicate grain size ~1.1 mm, up to 5.5 mm, n=105) composed of sub-rounded olivine, prismatic and elongate zoned pyroxene (mostly pigeonite, some displaying augite exsolution lamellae), and elongate plagioclase (completely converted into maskelynite) . Accessory phases include Ti-bearing Cr-rich spinel, ilmenite, merrillite, and troilite. Geochemistry: Olivine (Fa41.3±1.8, range Fa38.3-44.1, Fe/Mn=51±2, n=12), Low-Ca Pyroxene (Fs24.6±1.2Wo4.9±0.9, range Fs23.8-25.5Wo4.3-5.5, Fe/Mn=29±1, n=2), Pigeonite (Fs29.8±3.6Wo9.4±2.0, range Fs25.7-34.4Wo6.6-14.6, Fe/Mn=31±2, n=20), High-Ca Pyroxene (Fs22.1±1.1Wo31.2±1.0, range Fs21.3-22.8Wo30.4-31.9, Fe/Mn=26±1, n=2), Plagioclase (An50.4±4.3Or2.0±0.3, range An40.7-53.9Or1.5-2.8, n=18), Cr-rich Spinel (Cr#=83.3±0.8, Mg#=10.2±0.9, TiO2 wt. % = 4.9±3.3, n=3). Classification: Martian (olivine gabbroic). Specimens: 20.2 g at Cascadia, main mass with Matthew Stream. | ||||||||||||||||||||||||||||||
Data from: MB111 Table 0 Line 0: |
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Institutions and collections |
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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Photos: |
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Geography: |
Statistics: This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names) |