Meteoritical Bulletin: Entry for Northwest Africa 11422

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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: 213 g

Classification
history:

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

help

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: Fa_17.5±7.0(Fa_3.5-25.1, n=26); pyroxene: Fs_12.9±5.2Wo_1.6±1.0(Fs_2.3-16.8Wo_0.3-3.9, n = 17); type 6 lithology: olivine: Fa_18.4±0.1, n=12; pyroxene: Fs_16.3±0.2Wo_2.8±0.4, n=12; type 7 lithology: olivine: Fa_19.3±0.1, n=12; pyroxene: Fs_16.2±0.1Wo_4.2±0.2, n=13; Na-feldspar host: An_2.1Ab_91.7Or_6.2(n=5); K-feldspar lamellae: An_2.1Ab_34.0Or_63.9(n=2)

Data from:
  MB106
  Table 0
  Line 0:

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

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)

Catalogs:

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.

Find references in NASA ADS:
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Photos:

Credit	Photos
Public domain photographs:
Ansgar Greshake

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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