Meteoritical Bulletin: Entry for Northwest Africa 4812

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Northwest Africa 4812

Basic information

Name: Northwest Africa 4812
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4812
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass: 68 g

Classification
history:

Meteoritical Bulletin:	MB 94	(2008)	CK
Recommended:			CK [explanation]

This is 1 of 3 approved meteorites classified as CK. [show all]
Search for other: Carbonaceous chondrites, CK chondrites, and CV-CK clan chondrites

Comments:

Approved 17 Apr 2008

Writeup

help

Writeup from MB 94:

Northwest Africa 4812

Northwest Africa

Find: 2006

Carbonaceous chondrite (CK)

History and physical characteristics: A 68 g stone was purchased in Erfoud, Morocco, by Stefan Ralew in 2006. Patchy distribution of dark gray fusion crust and desert etching.

Petrography: (T. Bunch and J. Wittke, NAU) dark interior with very dark chondrules and shock-melt clasts, the matrix is nearly opaque. Highly shocked and shock-darkened by melting to partial melting of matrix and redistribution of fine-grained magnetite similar to shock darkening of ordinary chondrites and redistribution of fine-grained metal droplets. Contains olivine, orthopyroxene, pigeonite, plagioclase, felsic glasses, Cr-magnetite, FeS, and pentlandite. The shock level is S5 and weathering grade is low.

Mineral compositions: Olivine, Fa_30.3 (FeO/MnO = 110); orthopyroxene, Fs_26.4Wo_0.7 (FeO/MnO = 74); pigeonite, Fs_21.1Wo_12.1 (FeO/MnO = 64); plagioclase, An_59.3 and magnetite, Cr₂O₃ = 3.64 wt% and Al₂O₃ = 1.26 wt%.

Classification: Carbonaceous chondrite (CK). High shock effects preclude further subtype classification.

Type specimen: A total of 6.9 g and one thin section are on deposit at NAU. S. Ralew is the main mass holder.

Data from:
  MB94
  Table 2
  Line 61:

State/Prov/County:	Erfoud
Date:	2006
Mass (g):	68
Pieces:	1
Class:	CK
Shock stage:	moderate-extensive
Classifier:	T. Bunch and J. Wittke, NAU
Type spec mass (g):	13.2
Type spec location:	NAU

Institutions
and collections

NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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