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Northwest Africa 11422
Basic information Name: Northwest Africa 11422
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11422
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 213 g
Meteoritical Bulletin:  MB 106  (2018)  H3-7
Recommended:  H3-7    [explanation]

This is the only approved meteorite classified as H3-7.
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 23 Sep 2017
Writeup from MB 106:

Northwest Africa 11422 (NWA 11422)

(Northwest Africa)

Purchased: June, 2017

Classification: H3-7

History: The meteorite was bought June 2017 from a Moroccan meteorite dealer in Erfoud, Morocco.

Physical characteristics: Brownish individual lacking any fusion crust

Petrography: Chondritic breccia consisting of clastic H3 type matrix with embedded H4-7 clasts. Plagioclase grain size in H5 clasts is about 30 μm, in H6 clasts about 60 μm. Chondrules are about 0.15 to 0.4 mm in diameter. The type 7 clasts show a thoroughly recrystallized texture with abundant 120 degree grain boundaries. Grain sizes are about 100-400 μm. In some regions olivine is poikilitically enclosed by low-Ca pyroxene. Albitic feldspar is abundant and contains K-feldspar exsolution lamellae. No relict chondrules and no metal veinlets were observed in type 7 clasts.

Geochemistry: Type 3 lithology: olivine: Fa17.5±7.0 (Fa3.5-25.1, n=26); pyroxene: Fs12.9±5.2Wo1.6±1.0 (Fs2.3-16.8Wo0.3-3.9, n = 17); type 6 lithology: olivine: Fa18.4±0.1, n=12; pyroxene: Fs16.3±0.2Wo2.8±0.4, n=12; type 7 lithology: olivine: Fa19.3±0.1, n=12; pyroxene: Fs16.2±0.1Wo4.2±0.2, n=13; Na-feldspar host: An2.1Ab91.7Or6.2 (n=5); K-feldspar lamellae: An2.1Ab34.0Or63.9 (n=2)

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P June, 2017
Mass (g):213
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):17.5; 18.4; 19.3
Ferrosilite (mol%):12.9; 16.3; 16.2
Wollastonite (mol%):1.6; 2.8; 4.2
Classifier:A. Greshake, MNB
Type spec mass (g):21.8
Type spec location:MNB
Main mass:Hanno Strufe and Andreas Grünemeyer
Comments:Submitted by Ansgar Greshake
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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Public domain photographs:
Ansgar Greshake      

     This is 1 of 8037 approved meteorites from (Northwest Africa) (plus 1947 unapproved names)

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