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| Northwest Africa 7822 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 7822 This is an OFFICIAL meteorite name. Abbreviation: NWA 7822 Observed fall: No Year found: 2013 Country: (Northwest Africa) Mass:  45.8 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 151 approved meteorites classified as Achondrite-ung. [show all] Search for other: Achondrites, Ungrouped achondrites | ||||||||||||||||||||||||||||||
| Comments: | Approved 6 May 2013 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 102:
Northwest Africa 7822 (NWA 7822) (Northwest Africa) Purchased: 2013 Feb Classification: Ungrouped achondrite History: Purchased by Greg Hupé in February 2013 from a Moroccan dealer at the Tucson Gem and Mineral Show. Physical characteristics: A single stone (45.8 g) almost fully coated by dark fusion crust. The interior is mostly pale yellow with brown interstitial regions and sparse very small grains of fresh metal. Petrography: (A. Irving and S. Kuehner, UWS) Coarse-grained plutonic assemblage of predominantly (>90 vol.%) olivine with accessory chromite, taenite and troilite, plus very minor interstitial clinopyroxene and sodic plagioclase. Geochemistry: Olivine (Fa28.8-29.4, FeO/MnO = 92-107), clinopyroxene (Fs9.7-11.0Wo45.5-44.3, FeO/MnO = 50-62). Oxygen isotopes (K. Ziegler, UNM): Analysis of acid-washed interior subsamples by laser fluorination gave, respectively (all per mil), δ17O = -4.255, -4.390, -4.384; δ18O = -0.710, -0.655, -0.635; Δ17O = -3.850, -4.044, -4.049 (for a TFL slope of 0.528). Classification: Achondrite ungrouped. FeO/MnO ratios in constituent olivine in this dunitic specimen are very similar to those for olivine in the Eagle Station pallasite, and oxygen isotope compositions are comparable with those for both CV chondrites and Eagle Station. Specimens: 9.3 g of material and one polished thin section are on deposit at UWB. The main mass is held by GHupé. | ||||||||||||||||||||||||||||||
| Data from: MB102 Table 0 Line 0: |
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| Plots: | O isotopes: | ||||||||||||||||||||||||||||||
| 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) UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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| Geography: |
Statistics: This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names) | ||||||||||||||||||||||||||||||
| Crosslinks: |
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| Also see: |
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| Revision history: |
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