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| Northwest Africa 8563 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 8563 This is an OFFICIAL meteorite name. Abbreviation: NWA 8563 Observed fall: No Year found: 2014 Country: Mauritania Mass:  9.13 kg | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 281 approved meteorites classified as Eucrite-mmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||
| Comments: | Approved 8 Oct 2014 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 103:
Northwest Africa 8563 (NWA 8563) Mauritania Purchased: August 2014 Classification: HED achondrite (Eucrite, monomict) History: A 9125 g meteorite was purchased by Michael Farmer from a meteorite dealer in Tan Tan, Morocco. The stone is reportedly from Mauritania. Physical characteristics: Rounded, shiny sand-blasted stone lacking fusion crust. Large (22 × 19 cm) sawn and polished slab shows a breccia of tan, angular to rounded clasts to 3 cm in a dark matrix. Vesicles to 5 mm are common within the dark veins. Petrography: (L. Garvie, ASU) SEM examination of a polished mount shows a monomict, subophitic basaltic breccia of eucritic clasts separated by shock veins, some with cataclastic fine-grained regions. Clasts dominated by roughly equal proportions of low-Ca pyroxene (most grains with augite exsolution lamellae) and augite (most grains with low-Ca pyroxene exsolution lamellae), and calcic plagioclase; grain size to 600 μm. Silica locally abundant, with grains to 500 μm. Accessory low-Ni iron metal (to 50 μm), chromite with variable Ti content (to 20 μm), ilmenite (to 100 μm), and troilite (to 5 μm). Geochemistry: (L. Garvie, ASU) Low-Ca pyroxene Fs60.9±1.2Wo2.6±0.9, FeO/MnO=31.4±0.8, n=11; augite Fs26.6±0.8Wo43.5±0.9, FeO/MnO=31.5±1.4, n=11; plagioclase An90.2±0.6Ab9.5±0.5, n=5; silica with 0.3±0.1 wt% Al2O3 and 0.2±0.1 wt% FeO. Classification: Achondrite, monomict eucrite Specimens: 388 g and one polished mount at ASU. | ||||||||||||||||||||||||||||||
| Data from: MB103 Table 0 Line 0: |
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| Institutions and collections |
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012) MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address) |
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| References: | Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography:
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Statistics: This is 1 of 221 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters) | ||||||||||||||||||||||||||||||
| Also see: |
This lists the most popular meteorites among people who looked up this meteorite.
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| Revision history: |
This lists important revisions made to data for this record.
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