Meteoritical Bulletin: Entry for Northwest Africa 12766

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Northwest Africa 12766

Basic information

Name: Northwest Africa 12766
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12766
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass: 7.25 kg

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	L6-melt breccia
Recommended:			L6-melt breccia [explanation]

This is 1 of 71 approved meteorites classified as L6-melt breccia. [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 3 Aug 2019

Writeup

Writeup from MB 108:

Northwest Africa 12766 (NWA 12766)

(Northwest Africa)

Purchased: 2015 Sep

Classification: Ordinary chondrite (L6, melt breccia)

History: Purchased by Darryl Pitt in September 2015 from a Moroccan dealer at the Denver Show.

Petrography: (A. Irving, UWS and J. Boesenberg, Brown) Breccia composed of rounded Type 6 clasts (W1) in a black, very fine grained matrix (W0/1) containing abundant tiny spherical grains of metal and troilite. The clasts consist of rare chondrules within a recrystallized matrix containing stained metal, troilite, merrillite and chlorapatite.

Geochemistry: Olivine (Fa_24.5±0.3(range Fa_24.1-25.0), N = 6), low-Ca pyroxene (Fs_20.7±0.3Wo_1.8±0.2(range Fs_20.5-21.1Wo_1.4-2.1), N = 7), augite (Fs_7.8±0.2Wo_44.5±0.3(range Fs_7.6-7.9Wo_44.7-44.3), N = 2).

Classification: Ordinary chondrite (L6 melt breccia).

Specimens: 28.1 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Denver
Date:	P 2015 Sep
Mass (g):	7246
Pieces:	3
Class:	L6-melt breccia
Weathering grade:	W1
Fayalite (mol%):	24.5±0.3
Ferrosilite (mol%):	20.7±0.3
Wollastonite (mol%):	1.8±0.2
Classifier:	A. Irving, UWS, and J. Boesenberg, Brown
Type spec mass (g):	28.1
Type spec location:	UWB
Main mass:	D. Pitt
Comments:	Work name MAC 151; 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)
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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