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Northwest Africa 7872
Basic information Name: Northwest Africa 7872
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7872
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass:help 22.5 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 7872 (NWA 7872)

(Northwest Africa)

Purchased: Sept 2004

Classification: Ordinary chondrite (L3)

History: Marc Fries purchased an unclassified NWA meteorite on eBay and donated most of the sample to Cascadia on September 20, 2005.

Physical characteristics: Mainly gray exterior with one black fusion crusted side.

Petrography: (K. Armstrong and A. Ruzicka, Cascadia) The specimen shows chondritic texture with many relatively distinct, close-packed, sometimes glass-bearing chondrules (diameter = 0.7±0.4 mm, mean and standard deviation), and a matrix that appears opaque in transmitted light. A metal-poor igneous textured inclusion up to 4 mm across occurs adjacent to a centimeter-sized shock-blackened area. Metal and troilite abundances determined by pixel counting in reflected light images are 2.4±0.4 and 3±1 area%, respectively.

Geochemistry: Olivine Fa25.9±5.4 Fe/Mn=50.1±12.7 (N=80), low-Ca pyroxene Wo1.6±1.2 Fs18.3±8.0 Fe/Mn=30.2±13.1 (N=61).

Classification: L3 (S4) W1 chondrite, estimated subtype 3.7-3.8.

Specimens: 11.2 g in two pieces, one polished thin section, and a stub are on deposit at Cascadia.

Data from:
  Table 0
  Line 0:
Place of purchase:eBay
Date:P Sept 2004
Mass (g):22.5
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):25.9±5.4
Ferrosilite (mol%):18.3±8.0
Wollastonite (mol%):1.6±1.2
Classifier:K. Armstrong and A. Ruzicka, Cascadia
Type spec mass (g):11.2
Type spec location:Cascadia
Main mass:Cascadia
Comments:Lab Sample CML0359.; 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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