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Northwest Africa 8645
Basic information Name: Northwest Africa 8645
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8645
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 47 g
Meteoritical Bulletin:  MB 103  (2014)  L5
Recommended:  L5    [explanation]

This is 1 of 8948 approved meteorites (plus 5 unapproved names) classified as L5.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 15 Nov 2014
Writeup from MB 103:

Northwest Africa 8645 (NWA 8645)

(Northwest Africa)

Purchased: 2014 Mar 7

Classification: Ordinary chondrite (L5)

History: Donated to Cascadia by Dick Pugh, who purchased the meteorite on March 7, 2014, from Edwin Thompson, who obtained the sample from a Moroccan trader.

Physical characteristics: A faceted medium brownish gray specimen has remnant patches of fusion crust on its exterior. A large (>1 cm) discrete, light-colored inclusion is visible on an exterior surface.

Petrography: (A. Ruzicka and M. Hutson, Cascadia) Two light-colored regions containing euhedral olivine grains typical of an igneous lithology occur along edges of the thin section. The chondritic host is darkened by weathering product and an orange staining of the silicates. Chondrules are readily identifiable, with partially integrated margins and lacking glass in their interiors. Feldspar grains are typically 10-30 μm across. Eighteen out of 23 olivine grains examined have mosaic extinction and 2 sets of planar fractures. Isolated small patches of shock melt are present.

Geochemistry: Olivine (Fa 26.2±1.0, N=34), low-Ca pyroxene (Fs22.4±1.6Wo1.9±0.5, N=14), feldspar (Ab80.1±1.7Or8.3±2.4An11.6±1.9, N=10).

Classification: Based on the texture and composition, this is an L5 ordinary chondrite.

Specimens: Cascadia holds the entire sample which includes 44.7 g and 1 polished thin section.

Data from:
  Table 0
  Line 0:
Place of purchase:Portland, Oregon
Date:P 2014 Mar 7
Mass (g):47
Shock stage:S4
Fayalite (mol%):26.2±1.0
Ferrosilite (mol%):22.4±1.6
Wollastonite (mol%):1.9±0.5
Classifier:M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):44.7
Type spec location:Cascadia
Main mass:Cascadia
Comments:Lab number CML0800; 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)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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     This is 1 of 9806 approved meteorites from (Northwest Africa) (plus 1855 unapproved names)

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