Meteoritical Bulletin: Entry for Northwest Africa 12228

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Northwest Africa 12228

Basic information

Name: Northwest Africa 12228
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12228
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 44.6 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	LL3-6 melt breccia
Recommended:			LL3-6 melt breccia [explanation]

This is the only approved meteorite classified as LL3-6 melt breccia.
Search for other: LL chondrites, LL chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 27 Mar 2019

Writeup

Writeup from MB 108:

Northwest Africa 12228 (NWA 12228)

Northwest Africa

Purchased: 2018

Classification: LL3-6 melt breccia

History: Purchased by Fred Olsen in 2018 in Tucson, AZ.

Petrography: (D. Sheikh, FSU) Apart from one relict barred olivine (1054 um), no chondrules are present. Subangular clasts (0.5-7 mm) embedded in a dark matrix of impact melt. Feldspar present (10-100 um). Contains rounded blebs of troilite and angular grains of taenite. Equilibrated and unequilibrated clasts present.

Geochemistry: Equilibrated clasts: Olivine, Fa_29.9±0.5(N=32); Low Calcium Pyroxene, Fs_26.9±0.7Wo_2.9±0.2(N=25); High-Ca pyroxene, Fs_17.8±0.6Wo_31.6±0.9(N=25); Sodic plagioclase, An₁₂(N=4). Unequilibrated clasts: Olivine, Fa_25.8-38.8; low-Ca pyroxene, Fs_23.6-36.5Wo_2.3-6.1.

Classification: Ordinary Chondrite (LL3-6 melt breccia)

Specimens: 9.7 grams at UCLA; main mass with Olsen.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Tucson, AZ
Date:	P 2018
Mass (g):	44.57
Pieces:	1
Class:	LL3-6 melt breccia
Shock stage:	S2
Weathering grade:	W1
Classifier:	D. Sheikh, FSU
Type spec mass (g):	9.7
Type spec location:	UCLA
Main mass:	Olsen
Comments:	Submitted by Daniel Sheikh

Institutions
and collections

UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)

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:
Daniel Sheikh

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9370 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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