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Northwest Africa 12917
Basic information Name: Northwest Africa 12917
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12917
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 910 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 20 Oct 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12917 (NWA 12917)

(Northwest Africa)

Purchased: 19 mar 2019

Classification: Carbonaceous chondrite (CM2)

History: Purchased by Carlos Muñecas in 19 mar 2019 from a nomad in Guelmin, Morocco

Physical characteristics: Almost black individuals partly covered with fusion crust. Friable.

Petrography: Porous aggregate of chondrules with an apparent diameter of 0.2-2 mm (N=11) and often surrounded by fine-grained accretionary rims plus tiny mafic silicate grains (olivine and pyroxene) occur in an extremely fine-grained black matrix containing magnetite, sulfides and phyllosilicates (75-80 vol% by point counting).

Geochemistry: Mineral compositions and geochemistry: Mean values of defocused matrix analyses (all wt%; N=10): SiO2: 28.1, TiO2: 0.12; Na2O: 0.09; Cr2O3: 0.63, MgO: 18.2, MnO: 0.16, CaO: 0.15, FeO: 22.6, Al2O3: 1.98, NiO: 0.82, P2O5: 0.02, S: 0.65, Total: 73.5. Olivine Fa1.2-45.4, Cr2O3=0.22-0.49 (N=8). Low-Ca pyroxene Fs0.9-6.7Wo3.0-4.3 (N=4).

Classification: Carbonaceous chondrite (CM2)

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Guelmin, Morocco
Date:P 19 mar 2019
Mass (g):910
Pieces:8
Class:CM2
Shock stage:low
Weathering grade:low
Fayalite (mol%):25.9±20.2
Ferrosilite (mol%):3.3±1.7
Wollastonite (mol%):3.5±0.6
Classifier:J. Llorca, UPC
Type spec mass (g):20.8
Type spec location:UPC
Main mass:Carlos Muñecas
Comments:Submitted by Carlos Muñecas
Institutions
   and collections
UPC: Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya Diagonal 647, ed. ETSEIB, 08028 Barcelona, Spain, Spain (institutional address; updated 3 May 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
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Photos:
CreditPhotos
Public domain photographs:
Carlos Muñecas                  
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7005 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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