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Northwest Africa 7636
Basic information Name: Northwest Africa 7636
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7636
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 368 g
Meteoritical Bulletin:  MB 102  (2013)  R4
Recommended:  R4    [explanation]

This is 1 of 67 approved meteorites classified as R4.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)
Comments: Approved 12 Sep 2013
Writeup from MB 102:

Northwest Africa 7636 (NWA 7636)

(Northwest Africa)

Purchased: 2012 Oct

Classification: Rumuruti chondrite (R4)

History: Purchased in Morocco by A. and M. Hmani from a nomad.

Physical characteristics: Several pale-gray stones with a total weight of 368 g. Portions of the exterior surfaces have dull-black fusion crust, and there are pale orange weathering deposits on most exterior surfaces. The interiors of the stones are fresh.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of clasts containing chondrules (mostly PO and BO varieties) and abundant sulfides. Olivine, clinopyroxene, orthopyroxene, intermediate plagioclase, iron sulfide (probably troilite) and Ti-bearing chromite.

Geochemistry: Olivine (Fa39.8-40.4; FeO/MnO = 82-84), clinopyroxene (Fs9.9-11.4Wo46.6-43.8), orthopyroxene (Fs34.1-35.2Wo1.1-1.3; some more magnesian cores Fs13.1Wo1.3).

Classification: R4 chondrite.

Specimens: A total of 16.1 g of material and one polished thin section are on deposit at UWB. The main mass is held by Hmani.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2012 Oct
Mass (g):368
Shock stage:S2
Weathering grade:low
Fayalite (mol%):39.8-40.4
Ferrosilite (mol%):34.1-35.2
Wollastonite (mol%):1.1-1.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):23.1
Type spec location:UWB
Main mass:Hmani
Comments:OT02; submitted by A. Irving
   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)
Hmani: A. Hmani Moroccan Imports, 13 rue Jules Hardouin Mansart, 92600 Asnières, France (private address)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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