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Northwest Africa 11025
Basic information Name: Northwest Africa 11025
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11025
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 298 g
Meteoritical Bulletin:  MB 105  (2016)  H3
Recommended:  H3    [explanation]

This is 1 of 690 approved meteorites (plus 2 unapproved names) classified as H3.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 17 Dec 2016
Writeup from MB 105:

Northwest Africa 11025 (NWA 11025)

(Northwest Africa)

Find: 2011

Classification: Ordinary chondrite (H3)

History: Purchased by Dustin Dickens 2011 from a mineral dealer in Midelt, Morocco.

Physical characteristics: Single stone with flat, cracking, partially oxidized fusion crust covering the entire stone

Petrography: (A. Rubin, UCLA) Average chondrule size is 300-400 μm, in the H-chondrite range. The olivine distribution has a large peak at Fa17-18, within the H-chondrite range. The low average Fa value is due to a low-FeO tail in the distribution; the large standard deviations in olivine and pyroxene indicate that the rock is somewhat unequilibrated. Chondrules are very sharply defined, but chondrule glass is absent. However, there are shock features in the rock including irregular small troilite grains within metallic Fe-Ni grains, rare small grains of metallic Cu within metal grains and patches containing broken silicate fragments within troilite. This suggests that the rock has been shocked. Taken together with the sharp optical extinction of the olivine grains, it seems likely that the rock was shocked and then annealed. This is consistent with the paucity of polysynthetically twinned low-Ca monoclinic pyroxene grains.

Geochemistry: Mineral composition and geochemistry: olivine Fa15.6±4.8 (n=14) low-Ca pyroxene Fs14.9±3.7Wo1.4±0.6 (n=12)

Classification: H3

Specimens: 47.5 g at UCLA, including a thin section.

Data from:
  Table 0
  Line 0:
Mass (g):298
Shock stage:S1
Weathering grade:W1
Fayalite (mol%):15.6±4.8 (N=14)
Ferrosilite (mol%):14.92±3.7
Wollastonite (mol%):1.4±0.6 (N=12)
Classifier:A. Rubin, UCLA
Type spec mass (g):47.5
Type spec location:UCLA
Main mass:Dustin Dickens
Comments:TMSUCLA005; submitted by Dustin Dickens
   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)
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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     This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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