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Northwest Africa 8772
Basic information Name: Northwest Africa 8772
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8772
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 81.4 g
Meteoritical Bulletin:  MB 105  (2016)  R3
Recommended:  R3    [explanation]

This is 1 of 63 approved meteorites classified as R3.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 21 May 2016
Writeup from MB 105:

Northwest Africa 8772 (NWA 8772)

(Northwest Africa)

Purchased: 2014 Apr

Classification: Rumuruti chondrite (R3)

History: Purchased by Darryl Pitt in April 2014 from a dealer in Mauritania.

Petrography: (A. Irving and S. Kuehner, UWS) Separated chondrules (1.0±0.5 mm) occur within a red-brown matrix. Metal or altered metal is absent; accessory phases include ilmenite, Ti-chromite and Ni-bearing troilite.

Geochemistry: Olivine, Fa1.9-44.8; Cr2O3 in ferroan olivine = 0.05-0.08 wt.%, mean 0.07±0.01 wt.%, N = 8; orthopyroxene, Fs6.8-28.0Wo0.3-4.9, N = 3; augite, Fs10.1-10.2Wo45.4-45.5, N = 2. Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) from analysis of one acid-washed 1.5 mg aliquot of a powdered 40 mg bulk sample is δ17O=6.40‰, δ18O=7.91‰ , Δ17O=2.24‰ (linearized, slope 0.5247, analytical uncertainties 0.08‰, 0.12‰, 0.03‰ respectively). Magnetic susceptibility log χ (× 10-9 m3/kg) = 3.21.

Classification: Rumuruti chondrite (R3)

Specimens: 16.4 g including one polished thin section at UWB. The remainder is held by DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2014 Apr
Mass (g):81.4
Shock stage:S2
Weathering grade:high
Fayalite (mol%):1.9-44.8
Ferrosilite (mol%):6.8-28.0
Wollastonite (mol%):0.3-4.9
Magnetic suscept.:3.21
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):16.4
Type spec location:UWB
Main mass:D. Pitt
Comments:MAC 56; submitted by A. Irving
Plots: O isotopes:  
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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