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Northwest Africa 11913
Basic information Name: Northwest Africa 11913
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11913
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 54.7 g
Meteoritical Bulletin:  MB 107  (2018)  H5
Recommended:  H5    [explanation]

This is 1 of 11988 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 24 Jul 2018
Writeup from MB 107:

Northwest Africa 11913 (NWA 11913)

(Northwest Africa)

Purchased: 2013

Classification: Ordinary chondrite (H5)

History: Purchased by John A. Shea in 2013 via E-bay from an IMCA member who acquired it in a lot of northwest African meteorites.

Physical characteristics: Dark brown weathering patina with patches of rust covers all exterior surfaces

Petrography: In thin section, chondrules and fragments are delineated by a complex veining of weathering products (oxides and carbonate). Individual grains within chondrules are readily distinguished from mesostasis. Chondrule mesostases are devitrified and generally fine-grained, with feldspar grains typically small (< 10 microns in diameter), but up to ~40 μm across.

Geochemistry: (M. Hutson and A. Ruzicka, Cascadia) Olivine (Fa19.8±0.2, N=16), low-Ca pyroxene (Fs17.4±0.2Wo1.5±0.1, N= 16).

Classification: H5 chondrite based on chemistry and texture.

Specimens: Cascadia holds 11.4 g in two pieces, in addition to one polished thin section and a mounted butt.

Data from:
  Table 0
  Line 0:
Place of purchase:E-bay
Date:P 2013
Mass (g):54.7
Shock stage:S2
Weathering grade:W4
Fayalite (mol%):19.8 ± 0.2
Ferrosilite (mol%):17.4 ± 0.2
Wollastonite (mol%):1.5 ± 0.1
Classifier:M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):11.4
Type spec location:Cascadia
Main mass:John A. Shea, 8723 Maplebrook Parkway N., Brooklyn Park, MN 55445
Comments:Lab number CML0812; 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. 107, MAPS 55, 460-462
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     This is 1 of 9825 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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