Meteoritical Bulletin: Entry for Northwest Africa 12746

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Northwest Africa 12746

Basic information

Name: Northwest Africa 12746
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12746
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 12.1 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	CR2
Recommended:			CR2 [explanation]

This is 1 of 187 approved meteorites classified as CR2. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites

Comments:

Approved 27 Jul 2019

Writeup

Writeup from MB 108:

Northwest Africa 12746 (NWA 12746)

(Northwest Africa)

Purchased: 2019

Classification: Carbonaceous chondrite (CR2)

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

Physical characteristics: Dark brownish fragment with some fusion crust.

Petrography: Carbonaceous chondrite composed of abundant mostly slightly flattened chondrules with an apparent mean diameter of about 900 μm and 30-40% almost black matrix. Some chondrules are metal-decorated. Olivine and low-Ca pyroxene are the most abundant silicates and olivine is predominantly very Fe-poor (Fo around 98 mol%); few compositionally zoned olivines with more Fe-rich rims are present.

Geochemistry: Matrix analyses yield an average total of 89.4 wt% (5 µm defocused beam, N=10) suggesting the presence of hydrous minerals.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Erfoud, Morocco
Date:	P 2019
Mass (g):	12.1
Pieces:	1
Class:	CR2
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	8.2±9.9 (0.9-38.3, n=19)
Ferrosilite (mol%):	2.2±0.5 (1.5-3.1, n=17)
Wollastonite (mol%):	0.9±0.1 (0.7-1.1, n=17)
Magnetic suscept.:	5.2
Classifier:	A. Greshake, MNB
Type spec mass (g):	2.8
Type spec location:	MNB
Main mass:	Hanno Strufe
Comments:	Submitted by Ansgar Greshake

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)

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:
Ansgar Greshake

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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