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Northwest Africa 13999
Basic information Name: Northwest Africa 13999
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13999
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 89 g
Classification
  history:
Recommended:  CO3    [explanation]

This is 1 of 573 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 21 Jun 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13999 (NWA 13999)

(Northwest Africa)

Purchased: 2010 Jun

Classification: Carbonaceous chondrite (CO3)

History: Purchased from a Moroccan mineral dealer at the meteorite show in Ensisheim, France

Petrography: (K. Metzler, IfP) Chondrules, chondrule fragments, and CAIs are embedded in a fine-grained, dark brown matrix (about 30 vol% matrix). Most chondrules belong to chemical type I. Mean apparent chondrule size: 190±135 µm (80-1005 µm; n=76). Opaque phases are troilite and (terrestrially oxidized) metal.

Geochemistry: Mineral compositions and geochemistry: Random measurements of olivine grains revealed Fa35.7±5.6 (Fa8.4-39.3); n=52. Random measurements of low-Ca pyroxene grains revealed Fs4.0±1.0Wo1.1±0.3 (Fs1.9-5.8Wo0.4-1.6; n=21).

Classification: CO chondrite based on CAI occurrence, small chondrule size, chondrule-matrix ratio, and mineral chemistry. Petrologic type 3 based on the chemical variation of olivine and pyroxene. The proposed petrologic subtype is 3.8, based on the PMD of Fa values (16).

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Ensisheim, France
Date:P 2010 Jun
Mass (g):89
Pieces:4
Class:CO3
Shock stage:C-S1
Weathering grade:high
Fayalite (mol%):35.7±5.6
Ferrosilite (mol%):4.0±1.0
Wollastonite (mol%):1.1±0.3
Classifier:K. Metzler, IfP
Type spec mass (g):18
Type spec location:IfP
Main mass:Anonymous
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. 110, in preparation (2021)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7795 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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