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Northwest Africa 10312
Basic information Name: Northwest Africa 10312
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10312
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 10 kg
Meteoritical Bulletin:  MB 104  (2015)  H5
Recommended:  H5    [explanation]

This is 1 of 11759 approved meteorites (plus 23 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 15 Sep 2015
Writeup from MB 104:

Northwest Africa 10312 (NWA 10312)

(Northwest Africa)

Purchased: 2011 March

Classification: Ordinary chondrite (H5)

History: 86.6 g comprised of 4 pieces and smaller fragments of NWA meteorites were donated to Cascadia in April 2014.

Physical characteristics: The largest piece is irregular and shows extensive development of caliche and weathering patina on broken surfaces.

Petrography: (M. Ream and A. Ruzicka, Cascadia) Olivine is weakly mosaicized and most grains show 1 – 2 planar fracture sets, indicating shock stage S3. Sample contains ~2.5% each of metal and troilite, with perhaps slightly more troilite than metal, along with weathering products. Mean chondrule diameter is (N = 36) 0.7±0.3 mm. Matrix is dark, weathered, and fine grained.

Geochemistry: Olivine, Fa19.1±0.2 (Fa18.8–19.4, N = 12); low-Ca pyroxene, Fs17.0±0.3Wo 1.2±0.2 (Fs16.7–17.3Wo1.0–1.6, N = 6).

Classification: H5 chondrite based on mineral chemistry and chondrule integration.

Specimens: Cascadia holds three pieces (57.1 g, 4.4 g, 2.5 g), several small fragments, a polished thin section, and a potted butt. Keith Dickson holds the main mass.

Data from:
  Table 0
  Line 0:
Date:P 2011 March
Mass (g):10000
Shock stage:S3
Weathering grade:W3
Fayalite (mol%):19.1±0.2
Ferrosilite (mol%):17.0±0.3
Wollastonite (mol%):1.2±0.2
Classifier:M. Ream and A. Ruzicka, Cascadia
Type spec mass (g):87
Type spec location:Cascadia
Main mass:Keith Dickson
Comments:Lab number CML0805; 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. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 9746 approved meteorites from (Northwest Africa) (plus 1855 unapproved names)

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