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Northwest Africa 14265
Basic information Name: Northwest Africa 14265
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14265
Observed fall: No
Year found: 2002
Country: (Northwest Africa)
Mass:help 23 g
Classification
  history:
Recommended:  H4    [explanation]

This is 1 of 6313 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 6 Oct 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 14265 (NWA 14265)

(Northwest Africa)

Purchased: Feb 2002

Classification: Ordinary chondrite (H4)

History: One of a group of 31 stones given to the Cascadia Meteorite Laboratory (CML) by Edwin Thompson (ET Meteorites) in May 2002. These were part of a large lot of "Northwest Africa" stones that Thompson purchased at the Tucson Gem and Mineral Show in February 2002.

Physical characteristics: Physical Characteristics: Exterior of sample is broken, medium brown-gray weathered surface, with patches of pink caliche, and lacking any evidence of a fusion crust. Abundant chondrules protrude from the surface giving the sample a "bumpy" appearance.

Petrography: (M. Hutson, A. Ruzicka, Cascadia): In thin section, well-defined chondrules are set in a fine-grained matrix composed of angular mineral fragments. Chondrule mesostases consist of crystallite-filled glass. Olivine grains in chondrules are almost uniform in composition; numerous examples of dusty olivine grains were observed. Low-calcium clinopyroxene shows zoning in BSE images.

Geochemistry: Olivine: Fa19.9±0.2, N=33; Low-Ca pyroxene: Fs13.3±4.6Wo1.1±0.9, N=21.

Classification: Ordinary chondrite (H4) based on olivine chemistry; pyroxene chemistry suggests a high type 3 chondrite. Glassy, crystallite-filled chondrule mesostases consistent with a petrographic type near the 3-4 border.

Specimens: Cascadia holds the main mass, which is 20.9 g in one piece, as well as a polished thin section.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P Feb 2002
Mass (g):23
Pieces:1
Class:H4
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):19.9±0.2 (N=33)
Ferrosilite (mol%):13.3±4.6 (N=21)
Wollastonite (mol%):1.1±0.9 (N=21)
Classifier:M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):20.9
Type spec location:Cascadia
Main mass:Cascadia
Comments:Lab number CML 0027; 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)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8136 approved meteorites from (Northwest Africa) (plus 1942 unapproved names)

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