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Northwest Africa 7299
Basic information Name: Northwest Africa 7299
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7299
Observed fall: No
Year found: 2011
Country: Morocco
Mass:help 20 g
Classification
  history:
Meteoritical Bulletin:  MB 101  (2012)  Brachinite
Recommended:  Brachinite    [explanation]

This is 1 of 49 approved meteorites classified as Brachinite.   [show all]
Search for other: Brachinites, Primitive achondrites
Comments: Approved 27 Jul 2012
Writeuphelp
Writeup from MB 101:

Northwest Africa 7299 (NWA 7299)

Morocco

Purchased: 2011 Sept

Classification: Primitive achondrite (Brachinite)

Petrography: (P. Strickland, UAb). Petrographic microscope examination of a thin section shows 80% olivine, 10% orthopyroxene, 5% augite, 5% opaques and metals, and trace plagioclase. Opaques are dominanted by Fe-sulfides, with minor chromite. Olivine has irregular fractures and some grains display undulatory extinction. Most grains have prominent triple junctions. Consistent rusty-staining and oxidized metals indicate weak to moderate weathering. Medium-coarse grained equigranular matrix.

Geochemistry: (C. Herd and P. Strickland, UAb). Olivine Fa29.6±0.1, Fe/Mn=61.0; Low-Ca pyroxene Fs25.2±2.3, Wo2.2±0.1, Fe/Mn=40.5; Augite Fs9.9±0.2, Wo43.9±0.4, Fe/Mn=27.2; Chromite Cr#=0.981, Mg#=0.143, TiO2=1.05±0.09 wt%.

Classification: Brachinite

Specimens: 4.0 g type specimen, including polished thin section, are on deposit at UAb.

Data from:
  MB101
  Table 0
  Line 0:
Place of purchase:Denver
Date:P 2011 Sept
Mass (g):20
Pieces:1
Class:Brachinite
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):29.56±0.12 (n=9)
Ferrosilite (mol%):25.2±2.3 (n=8)
Wollastonite (mol%):2.2±0.1 (n=8)
Classifier:C. Herd and P. Strickland, UAb
Type spec mass (g):4.0
Type spec location:UAb
Main mass:D. Hurkot
Comments:Fs and Wo contents provided for low-Ca pyroxene.; submitted by C. Herd
Institutions
   and collections
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
Find references in NASA ADS:
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1402 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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