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Northwest Africa 15497 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 15497 This is an OFFICIAL meteorite name. Abbreviation: NWA 15497 Observed fall: No Year found: 2020 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 11 Dec 2022 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 111:
Northwest Africa 15497 (NWA 15497) (Northwest Africa) Purchased: 2020 Classification: Martian meteorite (Shergottite) History: Purchased by Daoud Wabish in 2020 from a meteorite dealer in Northwest Africa. Physical characteristics: Single fresh stone with shiny, black fusion crust with melt veins visible. Petrography: (V. Mugica, CSUF; D. Sheikh, Cascadia) Specimen displays a predominantly subophitic texture comprised of subhedral, compositionally zoned, prismatic and equant pigeonite grains (avg. grain size = 0.38 mm; n=79). Maskelynite is tabular and prismatic (avg. grain size = 0.71 mm; n=54) unzoned and set within a fine-grained matrix that includes accessory chlorapatite, merrillite, titanomagnetite, troilite and silica glass. Melt pockets are sparsely distributed throughout the sample. Geochemistry: Pigeonite (Fs59.0±15.1Wo17.4±3.4, range Fs32.2-83.9Wo10.9-24.9, Fe/Mn=35±4, n=95), High-Ca Pyroxene (Fs35.8±9.6Wo29.7±3.0, range Fs25.9-60.5Wo25.0-35.0, Fe/Mn=31±4, n=29), Maskelynite (An48.2±4.5Or2.7±1.6, range An40.8-54.1Or1.3-8.4, n=33). Classification: Martian (shergottite). Specimens: 2.42 grams at Cascadia, main mass with Daoud Wabish. | ||||||||||||||||||||||||||||
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) CSUF: California State University, Fullerton 800 N. State College Blvd. Fullerton, CA 92831-3599, United States (institutional address; updated 15 Jul 2023) |
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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) |