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Northwest Africa 12696 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12696 This is an OFFICIAL meteorite name. Abbreviation: NWA 12696 Observed fall: No Year found: 2017 Country: Algeria Mass: 20 kg | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 102 approved meteorites classified as Eucrite-melt breccia. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 27 Jul 2019 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 12696 (NWA 12696) Algeria Purchased: 2017 Classification: HED achondrite (Eucrite, melt breccia) History: Reportedly found in Algeria. Approximately 200 identically appearing pieces were purchased during a period commencing October 2017 from dealers in Mauritania and Morocco through February 2018, after which it was sold at the Tucson Show by numerous meteorite dealers. Physical characteristics: Saw cut reveals domains of vesiculated, dark gray, shock melt grading into a fragmental breccia of light-colored basaltic clasts. Petrography: (C. Agee, UNM) Microprobe examination shows basaltic clasts with approximately 60% pyroxene and 35% plagioclase grains most in the range 200-500 μm. Many pyroxene grains have exsolution lamellae. Shock melt veins and pockets are found throughout, many containing fragmental pyroxene and plagioclase grains. Ubiquitous minor chromite, troilite, and ilmenite were observed. Geochemistry: (C. Agee, UNM) Low-Ca pyroxene Fs61.9±1.4Wo2.5±0.8, Fe/Mn=31±1, n=8; high-Ca pyroxene Fs30.6±5.9Wo39.7±5.8, Fe/Mn=32±1, n=4; plagioclase An88.4±2.1, n=6. Classification: Eucrite-melt breccia, eucrite clasts are consistent with type 6 (Takeda and Graham, 1991) showing clear compositional separation of low and high calcium pyroxenes. Possibly paired with NWA 12342. Specimens: 22.7 g on deposit at UNM, DPitt holds the main mass. | ||||||||||||||||||||||||||||
Bibliography: |
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Data from: MB108 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) DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography: |
Statistics: This is 1 of 1344 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||||||||
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Revision history: |
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