Meteoritical Bulletin: Entry for Northwest Africa 11977

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Northwest Africa 11977

Basic information

Name: Northwest Africa 11977
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11977
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass: 72.9 g

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	CV3
Recommended:			CV3 [explanation]

This is 1 of 470 approved meteorites (plus 2 unapproved names) classified as CV3. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites

Comments:

Approved 27 Nov 2018

Writeup

help

Writeup from MB 107:

Northwest Africa 11977 (NWA 11977)

(Northwest Africa)

Purchased: Feb 2017

Classification: Carbonaceous chondrite (CV3)

History: Purchased by Li Bofang from a Morrocan dealer in Tucson in Feb 2017.

Physical characteristics: Dark brown 72.9 g stone, numerous chondrules are visible on the glossy, desert-varnished surface.

Petrography: (R. Bartoschewitz, Bart, B. Li, Beijing) thin section shows many chondrules <2.5 mm of various types (PO, PP, POP, RP), fine-grained, olivine-rich aggregates and CAIs are embedded in a fine-grained, dark brown matrix (roughly 40 vol%). Fe,Ni-rich metal and troilite are less abundant.

Geochemistry: (R. Bartoschewitz, Bart, P. Appel and B. Mader, Kiel) Olivine: Fa_14.7±5.0, Cr₂O₃=0.37±0.12, CaO=0.13±0.07 wt% (n=13); low-Ca pyroxene Fs_9.4±5.6Wo_0.8±0.7(n=14); pigeonite Fs_17.3Wo_6.2(n=1). Feldspar: An_14.2±1.3Or_8.0±0.6.Chromite: CRAL=96.9.7±5.3, FFM=96.4.7±3.2 (n=3). Kamacite: Ni=4.8-6.6, Co=0.5-1.8 (n=3); taenite: Ni=44.1, Co=0.6 (n=1) (wt.%); tetrataenite, troilite.

Classification: Carbonaceous chondrite (CV3).

Specimens: 14.6 g on deposit at Kiel, B. Li holds the main mass and 3.7 g with Bart.

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Tucson
Date:	P Feb 2017
Mass (g):	72.9
Pieces:	1
Class:	CV3
Shock stage:	S2
Fayalite (mol%):	14.7±5.0 (n=13)
Ferrosilite (mol%):	9.4±5.6 (n=14)
Wollastonite (mol%):	0.8±0.7
Magnetic suscept.:	3.89
Classifier:	R. Bartoschewitz, B. Li
Type spec mass (g):	14.6
Type spec location:	Kiel
Main mass:	Li Bofang, Beijing
Finder:	anonymous
Comments:	NWA-LB005; submitted by R. Bartoschewitz

Institutions
and collections

Kiel: Geologisches und Mineralogisches Museum, Institut für Geowissenschaften, Christian-Albrechts-Universität Kiel, Ludewig-Mayn-Str. 10, D-24118 Kiel, Germany, Germany (institutional address; updated 13 Sep 2013)
Bart: Bartoschewitz Meteorite Laboratory, Weiland 37, D-38518 Gifhorn, Germany; Website (private address; updated 30 Nov 2019)
Beijing: Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China (institutional address; updated 16 Oct 2011)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
history:

This lists important revisions made to data for this record.

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