Meteoritical Bulletin: Entry for Northwest Africa 12650

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Northwest Africa 12650

Basic information

Name: Northwest Africa 12650
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12650
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 1061 g

Classification
history:

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

This is 1 of 388 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 17 Jun 2019

Writeup

Writeup from MB 108:

Northwest Africa 12650 (NWA 12650)

(Northwest Africa)

Purchased: 2018 Jul

Classification: Ordinary chondrite (LL4)

History: Purchased by Ben Hoefnagels in July 2018 from a Moroccan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Fairly closely packed, relatively large chondrules occur within a finer matrix containing altered metal, chlorapatite and merrillite.

Geochemistry: Olivine (Fa_27.0±0.0, N = 3), low-Ca pyroxene (Fs_21.0±2.0Wo_1.1±0.6(range Fs_17.4-22.3Wo_1.8-0.6), N = 5), subcalcic augite (Fs_14.0Wo_27.8). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 3.81.

Classification: Ordinary chondrite (LL4).

Specimens: 51 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2018 Jul
Mass (g):	1061
Pieces:	1
Class:	LL4
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	27.0±0.0
Ferrosilite (mol%):	21.0±2.0
Wollastonite (mol%):	1.1±0.6
Classifier:	A. Irving & P. Carpenter
Type spec mass (g):	51
Type spec location:	UWB
Main mass:	B. Hoefnagels
Comments:	Work name BH159; 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 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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