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Northwest Africa 7822
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:help 45.8 g
Meteoritical Bulletin:  MB 102  (2013)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 128 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 6 May 2013
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:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2013 Feb
Mass (g):45.8
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):28.8-29.4
Ferrosilite (mol%):9.7-11.0
Wollastonite (mol%):45.5-44.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):9.3
Type spec location:UWB
Main mass:GHupe
Comments:GH-454; submitted by A. Irving
Plots: O isotopes:  
   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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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