Meteoritical Bulletin: Entry for Northwest Africa 12977

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Northwest Africa 12977

Basic information

Name: Northwest Africa 12977
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12977
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 958 g

Classification
history:

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

This is 1 of 487 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 12977 (NWA 12977)

(Northwest Africa)

Purchased: 2019 Aug

Classification: Ordinary chondrite (LL3)

Petrography: (K. Metzler, IfP) Ordinary chondrite of low petrologic type, consisting of closely packed chondrules (up to 2.2 mm) and chondrule fragments with low amounts of interchondrule matrix. The mean apparent chondrule size is 560 μm (n=68). Metal is almost completely oxidized by terrestrial weathering.

Geochemistry: Mineral compositions and geochemistry: The mean olivine composition is Fa_21.1±10.1(5.1-44.4; n=26); the mean low-Ca pyroxene composition is Fs_13.0±6.7Wo_1.4±1.2(Fs_1.7-31.7Wo_0.3-4.4; n=32).

Classification: LL chondrite based on the mean chondrule size. Petrologic subtype estimated as 3.5 due to the chemical variation of olivine (PMD of Fa values: 48).

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2019 Aug
Mass (g):	958
Pieces:	1
Class:	LL3
Shock stage:	S3
Weathering grade:	W4
Fayalite (mol%):	21.1±10.1
Ferrosilite (mol%):	13.0±6.7
Wollastonite (mol%):	1.4±1.2
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 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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