Meteoritical Bulletin: Entry for Northwest Africa 10828

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Northwest Africa 10828

Basic information

Name: Northwest Africa 10828
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10828
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass: 541 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	H4
Recommended:			H4 [explanation]

This is 1 of 6564 approved meteorites (plus 2 unapproved names) classified as H4. [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 24 Sep 2016

Writeup

Writeup from MB 105:

Northwest Africa 10828 (NWA 10828)

(Northwest Africa)

Purchased: 2009 Feb

Classification: Ordinary chondrite (H4)

History: Purchased by James Tobin in February 2009 from a dealer at the Tucson Gem show.

Petrography: Chondrules and chondrule fragments surrounded by secondary calcite, iron oxides, and void spaces. Secondary material and void spaces occasionally replace chondrule mesostases. Roughly 5-10% of the original metal is still present.

Geochemistry: Olivine (Fa_19.9±1.0, N=32); orthopyroxene (Fs_17.7±1.4Wo_1.2±0.7, N=33).

Specimens: Cascadia holds 23.8 g in two pieces, in addition to one polished thin section and a mounted butt.

Data from:
  MB105
  Table 0
  Line 0:

Place of purchase:	Tucson, AZ
Date:	P 2009 Feb
Mass (g):	541
Pieces:	1
Class:	H4
Weathering grade:	W3
Fayalite (mol%):	19.9±1.0
Ferrosilite (mol%):	17.7±1.4
Wollastonite (mol%):	1.2±0.7
Classifier:	M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):	23.8
Type spec location:	Cascadia
Main mass:	Jtobin
Comments:	Lab number CML 0854; submitted by Melinda Hutson

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)
Tobin: J. Tobin, The Meteorite Exchange, PMB #455, P.O. Box 7000, Redondo Beach, CA 90277, United States (private address)
JTobin: The Meteorite Exchange, Inc., United States; Website (private address; updated 28 Aug 2013)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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