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Northwest Africa 12815
Basic information Name: Northwest Africa 12815
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12815
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 10 g
Classification
  history:
Recommended:  CM2    [explanation]

This is 1 of 533 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 18 Aug 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12815 (NWA 12815)

(Northwest Africa)

Purchased: 2019

Classification: Carbonaceous chondrite (CM2)

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

Physical characteristics: Many small black fragments some of which partly covered with fusion crust.

Petrography: The meteorite is a chondritic breccia dominated by fine-grained almost opaque matrix composed of flaky phyllosilicates, sulfides, Ca-carbonates and rare FeNi metal, the latter mostly enclosed within olivine. Embedded in this matrix are chondrules (mean diameter about 250 μm), chondrule pseudomorphs, mineral fragments, and rare CAIs most of which are surrounded by fine-grained dust rims. Chondrule mesostasis has completely been replaced by alteration products.

Geochemistry: FeO in carbonate about 1 wt%

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019
Mass (g):10
Pieces:many
Class:CM2
Shock stage:S1
Weathering grade:low
Fayalite (mol%):12.4±14.0 (1.0-43.3, n=17)
Ferrosilite (mol%):1.9±1.3 (1.1-4.4, n=14)
Wollastonite (mol%):0.8±0.1 (0.8-0.9, n=14)
Classifier:A. Greshake, MNB
Type spec mass (g):2
Type spec location:MNB
Main mass:Vincent Gira
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. 108, in preparation (2019)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7009 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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