Meteoritical Bulletin: Entry for Northwest Africa 12975

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Northwest Africa 12975

Basic information

Name: Northwest Africa 12975
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12975
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 228 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	LL3
Recommended:			LL3 [explanation]

This is 1 of 365 approved meteorites classified as LL3. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 2 Nov 2019

Writeup

Writeup from MB 108:

Northwest Africa 12975 (NWA 12975)

(Northwest Africa)

Purchased: 2019 Jul

Classification: Ordinary chondrite (LL3)

Petrography: (K. Metzler, IfP) Brecciated ordinary chondrite of low petrologic type. It consists of chondrules (up to 3.5 mm), chondrule fragments, mineral fragments, and mm-sized unequilibrated chondrite clasts, embedded in a fine-grained clastic matrix. The mean apparent chondrule size is 680 μm (n=53). Small amounts of Fe,Ni metal and troilite, mostly residing outside of chondrules.

Geochemistry: Mineral compositions and geochemistry: The mean olivine composition is Fa_19.1±8.7(Fa_3.9-33.5; n=26); the mean low-Ca pyroxene composition is Fs_14.0±6.8Wo_0.8±0.8(Fs_5.6-24.3Wo_0.1-2.8; n=11).

Classification: LL chondrite based on metal content and apparent chondrule size. Petrologic type based on the chemical variation of olivine (PMD of Fa values: 46), estimated LL3.5.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2019 Jul
Mass (g):	228
Pieces:	1
Class:	LL3
Shock stage:	S1
Weathering grade:	W2
Fayalite (mol%):	19.1±8.7
Ferrosilite (mol%):	14.0±6.8
Wollastonite (mol%):	0.8±0.8
Classifier:	K. Metzler, IfP
Type spec mass (g):	20
Type spec location:	IfP
Main mass:	Mirko Graul, Bernau, Germany
Comments:	Submitted by K. Metzler, IfP

Institutions
and collections

IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 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 7655 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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