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Northwest Africa 11732
Basic information Name: Northwest Africa 11732
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11732
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 3.8 g
Classification
  history:
Recommended:  CM2.0    [explanation]

This is 1 of 2 approved meteorites classified as CM2.0.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 19 Apr 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11732 (NWA 11732)

(Northwest Africa)

Purchased: 2017

Classification: Carbonaceous chondrite (CM2.0)

History: The meteorite was purchased from a local meteorite dealer in Morocco.

Physical characteristics: Small black individual with some fusion crust.

Petrography: The meteorite is a brecciated carbonaceous chondrite composed of chondrule, mineral and CAI polymorphs set into a fine-grained matrix of phyllosilicates (as indicated by fibrous appearance), carbonates and sulfides including up to 400 μm long needles of Ni-bearing pyrrhotite. Carbonates are almost pure calcites and Mg-Mn-Fe-rich varieties. The hydrous and porous nature of the matrix is also proven by low analytical totals of defocused (10 μm beam diameter) electron microprobe analyses. Many components are surrounded by flaky phyllosilicates apparently replacing former dust rims. No anhydrous silicates have been found.

Geochemistry: Mean values of defocused (10 μm beam diameter) matrix analyses (all wt%; N=27): SiO2: 27.0, TiO2: 0.09; Na2O: 0.11; Cr2O3: 0.41, MgO: 19.8, MnO: 0.18, CaO: 0.25, FeO: 21.7, Al2O3: 2.29, NiO: 0.79, P2O5: 0.03, S: 0.36, Total: 73.01

Classification: CM2.0. Subtype based on the absence of anhydrous silicates.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017
Mass (g):3.8
Pieces:1
Class:CM2.0
Shock stage:S2
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
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake               
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6759 approved meteorites from (Northwest Africa) (plus 2047 unapproved names)

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