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Northwest Africa 12936
Basic information Name: Northwest Africa 12936
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12936
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 515 g
Meteoritical Bulletin:  MB 108  (2020)  L6
Recommended:  L6    [explanation]

This is 1 of 12995 approved meteorites (plus 11 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 11 Oct 2019
Writeup from MB 108:

Northwest Africa 12936 (NWA 12936)

(Northwest Africa)

Purchased: Nov 2013

Classification: Ordinary chondrite (L6)

History: John Shea purchased an NWA sample from meteorite dealer Greg Catterton in November 2013.

Physical characteristics: An end piece of the meteorite has a dark brown fusion crust on most external surfaces; one side is orange due to weathering. Most of the cut face is medium brown, with a light-colored clast 2.5 × 0.5 cm in exposed area.

Petrography: (M. Hutson, A. Ruzicka, B. Rapozo, Cascadia): In transmitted light, the sample is broken into clasts separated by thin opaque veins. The texture of the silicates in thin section is well-integrated; indistinct chondrules are barely visible. Plagioclase feldspar has been converted to maskylenite. Thin web-like shock veins composed of sulfide cross the section. Approximately 20-30% of the metal and sulfide have been replaced by iron hydroxide weathering product.

Geochemistry: Mineral compositions and geochemistry: Olivine and pyroxene grains are equilibrated: Fa24.8±0.3, N=14; Fs21.0±0.2 Wo1.4±0.1, N=15.

Classification: Ordinary chondrite (L6) based on chemistry and texture.

Specimens: Cascadia holds 131.4 g in five pieces, in addition to a polished thin section and a mounted butt. The main mass is held by Shea: John A. Shea, Wallingford PA

Data from:
  Table 0
  Line 0:
Place of purchase:ebay
Date:P Nov 2013
Mass (g):515
Shock stage:S5
Weathering grade:W2
Fayalite (mol%):24.8±0.3 (N=14)
Ferrosilite (mol%):21.0±0.2 (N=15)
Wollastonite (mol%):1.4±0.1 (N=15)
Classifier:M. Hutson and B. Rapozo, Cascadia
Type spec mass (g):131.4
Type spec location:Cascadia
Main mass:Shea
Comments:Lab number CML 0911; submitted by M. Hutson
   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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 9825 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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