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Northwest Africa 11996
Basic information Name: Northwest Africa 11996
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11996
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 960 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  CO3
Recommended:  CO3    [explanation]

This is 1 of 651 approved meteorites (plus 1 unapproved name) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 9 Oct 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11996 (NWA 11996)

(Northwest Africa)

Purchased: 2017 Apr

Classification: Carbonaceous chondrite (CO3)

History: Bought from an African mineral dealer in Alicante, Spain

Petrography: (K. Metzler, IfP) Chondrules, chondrule fragments, and CAIs, embedded in a fine-grained brownish matrix (about 20 vol% matrix). The vast majority of chondrules belong to chemical type I. Mean apparent chondrule size: 180 ±120 µm (70-930 µm; n=95).

Geochemistry: Mineral compositions and geochemistry: Random measurements of olivine grains revealed Fa36.0±8.0 (Fa6.0-40.5); n=25. Random measurements of low-Ca pyroxene grains revealed Fs5.7±3.1Wo2.8±1.4 (Fs2.0-14.0Wo1.0-5.0); n=21.

Classification: CO chondrite based on CAI occurrence, small chondrule size, chondrule-matrix ratio, and mineral chemistry. Petrologic type 3.7 estimated from chemical variation of olivine and pyroxene (PMD-Fa = 22.2).

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Tinduf, Algeria
Date:P 2017 Apr
Mass (g):960
Pieces:Many
Class:CO3
Shock stage:S1
Weathering grade:W2
Fayalite (mol%):36.0±8.0
Ferrosilite (mol%):5.7±3.1
Wollastonite (mol%):2.8±1.4
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Manuel Nieto Sanchez, Albacete, Spain
Comments:Submitted by K. Metzler, IfP
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)
Also see:
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Revision
  history:
  This lists important revisions made to data for this record.

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