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Northwest Africa 7869
Basic information Name: Northwest Africa 7869
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7869
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass:help 97.9 g
Meteoritical Bulletin:  MB 102  (2013)  L3
Recommended:  L3    [explanation]

This is 1 of 859 approved meteorites (plus 2 unapproved names) classified as L3.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 29 May 2013
Writeup from MB 102:

Northwest Africa 7869 (NWA 7869)

(Northwest Africa)

Purchased: Feb 2004

Classification: Ordinary chondrite (L3)

History: A rock was purchased by Dick Pugh from a Moroccan trader at the Tucson Gem and Mineral Show and donated to Cascadia in February, 2004.

Physical characteristics: Gray to brown bumpy surface with flatter and apparently broken edges.

Petrography: (K. Armstrong and A. Ruzicka, Cascadia) Chondritic texture with distinct edges for chondrules (diameter = 0.7±0.3 mm, mean and standard deviation) and a matrix that appears opaque in transmitted light. Metal and troilite abundances determined by pixel counting in reflected light images are 1.6±0.1 and 1.5±0.5 area%, respectively.

Geochemistry: Olivine Fa23.8±5.1 Fe/Mn=53.7±9.4 (N=62) and low-Ca pyroxene Wo2.3±1.9 Fs13.7±6.3 Fe/Mn = 24.7±17.8 (N=30).

Classification: L3 (S3) W1 chondrite with estimated subtype 3.7-3.8.

Specimens: 94.3 g in four pieces and one polished thin section and butt are available at Cascadia.

Data from:
  Table 0
  Line 0:
Place of purchase:Tuscon, Arizona
Date:P Feb 2004
Mass (g):97.9
Shock stage:S3
Weathering grade:W1
Fayalite (mol%):23.8±5.1
Ferrosilite (mol%):13.7±6.3
Wollastonite (mol%):2.3±1.9
Classifier:K. Armstrong and A. Ruzicka, Cascadia
Type spec mass (g):94.3
Type spec location:Cascadia
Main mass:Cascadia
Comments:Lab Sample CML0143.; submitted by A. Ruzicka
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 9825 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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