Meteoritical Bulletin: Entry for Northwest Africa 12970

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Northwest Africa 12970

Basic information

Name: Northwest Africa 12970
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12970
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 3 kg

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	L3
Recommended:			L3 [explanation]

This is 1 of 714 approved meteorites (plus 1 unapproved name) classified as L3. [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 21 Nov 2019

Writeup

Writeup from MB 108:

Northwest Africa 12970 (NWA 12970)

(Northwest Africa)

Purchased: 2019 May

Classification: Ordinary chondrite (L3)

History: Purchased in Agadir, Morocco by Aziz Habibi in May 2019.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed, closely-packed chondrules (apparent diameter 890±490 µm, N = 25) are set in a sparse finer-grained matrix containing stained metal.

Geochemistry: Olivine (Fa_18.6±11.7(range Fa_3.0-30.3, Cr₂O₃ <0.05 wt.%, N = 7), low-Ca pyroxene (Fs_12.0±11.8Wo_1.1±0.6(range Fs_1.5-24.9Wo_0.6-1.7, N = 2), high-Ca pyroxene (Fs_3.6Wo_38.8). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 4.70.

Classification: Ordinary chondrite (L3).

Specimens: 33.6 g including one polished thin section at UWB; remainder with Mr. A. Habibi.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Agadir
Date:	P 2019 May
Mass (g):	3000
Pieces:	many
Class:	L3
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	18.6±11.7
Ferrosilite (mol%):	12.0±11.8
Wollastonite (mol%):	1.1±0.6
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	34
Type spec location:	UWB
Main mass:	A. Habibi
Comments:	Work name AH 721; submitted by A. Irving

Institutions
and collections

UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7579 approved meteorites from (Northwest Africa) (plus 1969 unapproved names)

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