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Northwest Africa 3197
Basic information Name: Northwest Africa 3197
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 3197
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 324 g
Meteoritical Bulletin:  MB 102  (2013)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 400 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 6 Sep 2013
Writeup from MB 102:

Northwest Africa 3197 (NWA 3197)

(Northwest Africa)

Purchased: 2010 Feb

Classification: HED achondrite (Howardite)

History: Purchased by Peter Utas in 2010 February from a Moroccan dealer at the Tucson Gem and Mineral Show.

Physical characteristics: A single, fine-grained breccia (324 g) containing abundant clasts with evident altered metal.

Petrography: (A. Irving and S. Kuehner, UWS) Complex polymict breccia composed of clasts and crystal debris from several types of gabbroic eucrites and diogenites, plus large clasts of metal-bearing ordinary chondrites exhibiting various levels of shock. The howardite portions contain small diogenite clasts and angular grains of orthopyroxene, pigeonite (some exsolved), calcic plagioclase, silica polymorph, chromite and troilite. Chondrite clasts contain sparse chondrules and abundant altered kamacite, and some have extensive marginal zones composed of very fine grained, recrystallized silicates with larger, rounded globules of intergrown metal and troilite.

Geochemistry: Orthopyroxene (Fs17.8Wo1.7; Fs26.6Wo3.1; Fs36.3Wo2.3; FeO/MnO = 26-32), clinopyroxene exsolution lamellae (Fs23.9-26.1Wo43.4-42.5, FeO/MnO = 29-30). Olivine in chondritic clasts (Fa15.3-18.9, FeO/MnO = 39-32).

Classification: Howardite. The specimen is anomalous in that it contains clasts of recrystallized and shocked H chondrite material.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2010 Feb
Mass (g):324
Shock stage:medium
Weathering grade:medium
Fayalite (mol%):15.3-18.9
Ferrosilite (mol%):17.8-36.3
Wollastonite (mol%):1.7-2.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.2
Type spec location:UWB
Main mass:Utas
Comments:Submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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