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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
Recommended:  CO3    [explanation]

This is 1 of 618 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
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:
  Table 0
  Line 0:
Place of purchase:Ensisheim, France
Date:P 2010 Jun
Mass (g):89
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
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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