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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
Meteoritical Bulletin:  MB 110  (2022)  H4
Recommended:  H4    [explanation]

This is 1 of 6529 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
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:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P Feb 2002
Mass (g):23
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
   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)
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 9747 approved meteorites from (Northwest Africa) (plus 1866 unapproved names)

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