NWA 11422 (13,827 g)
This is the only approved meteorite classified as H3-7.
Northwest Africa 11422 (NWA 11422)
Purchased: June, 2017
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.
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|
|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|