Meteoritical Bulletin: Entry for Northwest Africa 12432

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Northwest Africa 12432

Basic information

Name: Northwest Africa 12432
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12432
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass: 253 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	H5
Recommended:			H5 [explanation]

This is 1 of 11372 approved meteorites (plus 22 unapproved names) classified as H5. [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 23 Jan 2019

Writeup

Writeup from MB 108:

Northwest Africa 12432 (NWA 12432)

(Northwest Africa)

Purchased: 12 Dec 2016

Classification: Ordinary chondrite (H5)

Physical characteristics: Exterior surfaces are dark brown; interior cut faces are medium-to-dark brown, with numerous lighter brown chondrules visible.

Petrography: (M. Hutson, A. Ruzicka, Cascadia) Extensive veins of iron hydroxides cut across the thin section, cross-cutting chondrules and causing the material between chondrules to be opaque in transmitted light.

Geochemistry: Mineral compositions and geochemistry: (M. Hutson, R. Kostynick, A. Ruzicka, Cascadia) Olivine (Fa_18.3±0.2, N=26; low-Ca pyroxene (Fs_16.3±0.2Wo_1.3±0.2, N=26).

Classification: H5 based on iron contents in olivine and pyroxene.

Specimens: Cascadia holds 47.2 g in three pieces, in addition to a polished thin section and a mounted butt.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Ebay
Date:	P 12 Dec 2016
Mass (g):	253.2
Pieces:	1
Class:	H5
Weathering grade:	W3
Fayalite (mol%):	18.3±0.2
Ferrosilite (mol%):	16.3±0.2
Wollastonite (mol%):	1.3±0.2
Classifier:	M. Hutson, R. Kostynick, A. Ruzicka, Cascadia
Type spec mass (g):	47.2
Type spec location:	Cascadia
Main mass:	Bastien Baecker, Huntsville
Comments:	Lab number CML 0941; submitted by Alex Ruzicka

Institutions
and collections

Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)

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 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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