Meteoritical Bulletin: Entry for Northwest Africa 12917

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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: 910 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	CM2
Recommended:			CM2 [explanation]

This is 1 of 636 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

Writeup

help

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 Fa_1.2-45.4, Cr₂O₃=0.22-0.49 (N=8). Low-Ca pyroxene Fs_0.9-6.7Wo_3.0-4.3(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 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Photos:

Credit	Photos
Public domain photographs:
Carlos Muñecas

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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