Meteoritical Bulletin: Entry for Northwest Africa 12950

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Northwest Africa 12950

Basic information

Name: Northwest Africa 12950
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12950
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass: 1576 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	LL4
Recommended:			LL4 [explanation]

This is 1 of 389 approved meteorites classified as LL4. [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 11 Oct 2019

Writeup

Writeup from MB 108:

Northwest Africa 12950 (NWA 12950)

(Northwest Africa)

Purchased: 2016 Sep

Classification: Ordinary chondrite (LL4)

History: Purchased by Darryl Pitt in September 2016 from a Moroccan dealer at the Denver Show.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed, closely packed equilibrated chondrules (apparent diameter 1100±550 µm, N = 22) are set in a sparse finer-grained matrix containing stained metal.

Geochemistry: Olivine, Fa_27.1±0.1(range Fa_26.9-27.2, N = 5); low-Ca pyroxene, Fs_22.4±0.2Wo_1.7±0.2(range Fs_22.2-22.8Wo_1.4-2.0, N = 5). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 4.35.

Classification: Ordinary chondrite (LL4).

Specimens: 20.8 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Denver
Date:	P 2016 Sep
Mass (g):	1576
Pieces:	1
Class:	LL4
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	27.1±0.1
Ferrosilite (mol%):	22.4±0.2
Wollastonite (mol%):	1.7±0.2
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	20.8
Type spec location:	UWB
Main mass:	DPitt
Comments:	Work name MVCH 481; 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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)

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 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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