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Northwest Africa 7180
Basic information Name: Northwest Africa 7180
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7180
Observed fall: No
Year found: 2011
Country: Algeria
Mass:help 241 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  H3.6
Recommended:  H3.6    [explanation]

This is 1 of 43 approved meteorites classified as H3.6.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 2 Mar 2012
Writeuphelp
Writeup from MB 100:

Northwest Africa 7180 (NWA 7180)

Algeria

Purchased: 11 July 2011

Classification: Ordinary chondrite (H3.6)

Petrography: Chondrules average about 300 μm. The mean olivine Fa content is closest to the H-chondrite range. A few chondrules have isotropic glass. Polysynthetically twinned low-Ca pyroxene grains are common. The review paper by Sears and Hasan (1987) gives the ranges for standard deviations for different subtypes of type-3 OC. The standard deviation of olivine Fa divided by mean Fa in this rock is 37; this corresponds to type 3.6 in the Sears-Hasan table.

Data from:
  MB100
  Table 1
  Line 1661:
Place of purchase:online
Date:P 11 July 2011
Mass (g):240.5
Pieces:1
Class:H3.6
Shock stage:S1
Weathering grade:W4
Fayalite (mol%):16.8±6.2 (n=16)
Ferrosilite (mol%):11.0±4.2 (n=4)
Wollastonite (mol%):0.6±0.4
Classifier:Alan Rubin, UCLA
Type spec mass (g):35.1
Type spec location:UCLA
Main mass:William Feek
Comments:Submitted by Alan Rubin
Institutions
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 979 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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