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Northwest Africa 6962
Basic information Name: Northwest Africa 6962
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6962
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 59.8 g
Classification
  history:
Meteoritical Bulletin:  MB 101  (2012)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 84 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 18 Oct 2012
Writeuphelp
Writeup from MB 101:

Northwest Africa 6962 (NWA 6962)

(Northwest Africa)

Purchased: 2011 Sep

Classification: Ungrouped achondrite

History: Purchased by Mike Farmer in 2011 September from a Moroccan dealer at the Denver Mineral Show.

Physical characteristics: A single stone (59.8 g) coated by a brown patina. The interior is mostly brownish yellow with tiny, fresh metal grains and only minor secondary staining along grain boundaries.

Petrography: (A. Irving and S. Kuehner, UWS) Aggregate of predominantly olivine (as equant grains) and sporadic grains of Ti-poor chromite, sparse kamacite and iron sulfide, plus interstitial regions of intergrown intermediate plagioclase, clinopyroxene and minor merrillite. Olivine grains contain small melt inclusions (composed of Na-bearing glass+chromite+Ni-free metal) and also inclusions of more Ti-rich chromite.

Geochemistry: Olivine (Fa47.1-47.9; FeO/MnO = 67-71; CaO = 0.42-0.48 wt.%), clinopyroxene (Fs15.4-20.0Wo44.6-45.2; FeO/MnO = 40-52; Cr2O3 0.69-0.92 wt.%), plagioclase (An21.1-31.7Or0.5). Oxygen isotopes (R. Tanaka, OkaU): laser fluorination analyses on acid-washed subsamples gave, respectively δ17O = 2.190, 2.191; δ18O = 6.144, 6.130; Δ17O = -1.041, -1.032 per mil.

Classification: Ungrouped achondrite, brachinite-like. This specimen is much more ferroan than typical brachinites and has a significantly different oxygen isotopic composition.

Specimens: A total of 12.4 g of type material and one polished thin section are on deposit at UWB. The remaining material is held by MFarmer.

Data from:
  MB101
  Table 0
  Line 0:
Place of purchase:Denver
Date:P 2011 Sep
Mass (g):59.8
Pieces:1
Class:Achondrite-ung
Shock stage:low
Weathering grade:low
Fayalite (mol%):47.1-47.9
Ferrosilite (mol%):15.4-20.0
Wollastonite (mol%):44.6-45.2
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):12.4
Type spec location:UWB
Main mass:MFarmer
Comments:MF11-1; submitted by A. Irving
Plots: O isotopes:  
Institutions
   and collections
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)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

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