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Northwest Africa 7872 | |||||||||||||||||||||||||||||||
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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: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 811 approved meteorites (plus 1 unapproved name) 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![]() |
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: MB102 Table 0 Line 0: |
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Institutions 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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Geography: |
Statistics: This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names) |