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Northwest Africa 10923
Basic information Name: Northwest Africa 10923
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10923
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 3.8 g
Meteoritical Bulletin:  MB 105  (2016)  C1/2-ung
Recommended:  C1/2-ung    [explanation]

This is 1 of 2 approved meteorites classified as C1/2-ung.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 1), Carbonaceous chondrites (type 2), and Ungrouped chondrites
Comments: Approved 10 Dec 2016
Writeup from MB 105:

Northwest Africa 10923 (NWA 10923)

(Northwest Africa)

Purchased: 2016

Classification: Carbonaceous chondrite (C1/2, ungrouped)

History: The meteorite was bought in 2016 from Aziz Habibi, Morocco.

Physical characteristics: The small black individual is partly covered by fusion crust.

Petrography: The meteorite appears strongly brecciated and is composed of chondrule pseudomorphs (30-400 μm in diameter), hydrated mineral fragments, carbonates and Fe,Ni sulfides all sent into a fine-grained Fe-rich matrix. Some chondrules are surrounded by dust rims. In the section studied, no anhydrous silicates, e.g., olivine or pyroxene have been found. Also, no metal has been detected. Very low totals of defocused matrix analyses attest to high porosity and the presence of hydrous phases, i.e., phyllosilicates.

Geochemistry: Mean values of defocused matrix analyses (all wt%; N=50): SiO2: 24.8, TiO2: 0.13; Na2O: 0.1; K2O: 0.03, Cr2O3: 0.47, MgO: 16.7, MnO: 0.15, CaO: 0.62, FeO: 22.6, Al2O3: 2.44, NiO: 1.8, P2O5: 0.26, S: 2.24, Total: 72.14; Ca-carbonates contain about 2 wt% FeO.

Classification: Due to the lack of anhydrous silicates but preserved chondrule pseudomorphs, a C1/2 classification is suggested.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2016
Mass (g):3.8
Shock stage:S1
Weathering grade:low
Classifier:A. Greshake, MNB
Type spec mass (g):0.8
Type spec location:MNB
Main mass:Philippe Schmitt-Kopplin
Comments:Submitted by Ansgar Greshake
   and collections
MNB: Museum f├╝r Naturkunde, Invalidenstra├če 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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