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| Northwest Africa 12868 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 12868 This is an OFFICIAL meteorite name. Abbreviation: NWA 12868 Observed fall: No Year found: 2013 Country: Morocco Mass:  536 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 604 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites | ||||||||||||||||||||||||||||||
| Comments: | Approved 29 Feb 2020 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 109:
Northwest Africa 12868 (NWA 12868) Morocco Purchased: 2013 Classification: Ureilite History: Purchased by D. Gregory in Tuscon, Arizona, from from Said Haddany in 2013. S. Haddany accredits the source of the material to Morocco. Type specimen is catalogued at ROM as M58158. Physical characteristics: The sample is covered by a weakly weathered, dark fusion crust. Petrography: The sample exhibits medium to coarse-grained cumulate texture, with major olivine approximately 60%, low-Ca pyroxene 34%, and carbon 4%. Olivine grains exhibit planar fracturing, undulatory extinction, and minor reduction rims. Low-Ca pyroxene exhibits twinning and undulatory extinction. Raman analysis confirms graphite is the carbon phase. Geochemistry: Mineral compositions and geochemistry: Olivine cores: Fa13.8±2.5 (n=12), 0.01±0.00 wt% CaO, 0.02±0.00 wt% Cr2O3, and 0.01±0.00 wt% MnO. Pyroxene cores: Fs12.6±0.2Wo9.9±0.1 (n=10), 0.19±0.00 wt% CaO, 0.03±0.00 wt% Cr2O3, and 0.01±0.00 wt% MnO. Classification: Achondrite (ureilite). Low shock, moderate weathering. Specimens: The 23.84 g sample and one thin section are held at the ROM. | ||||||||||||||||||||||||||||||
| Data from: MB109 Table 0 Line 0: |
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| Institutions and collections |
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011) UTorG: University of Toronto, Dept. Geology, Earth Sciences Centre, 22 Russell Street Toronto, Ontario, M5S 3B1, Canada (institutional address; updated 31 Jan 2011) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:
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Statistics: This is 1 of 1837 approved meteorites from Morocco (plus 24 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||