NWA 11422 (2,441 g)

NWA 11422 (2,441 g)

This is the only approved meteorite classified as H3-7.

 

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);

 

Place of purchase: Erfoud, Morocco
Date: P June, 2017
Mass (g): 213
Pieces: 1
Class: H3-7
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

 

 

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