Meteoritical Bulletin: Entry for Northwest Africa 7576

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Northwest Africa 7576

Basic information

Name: Northwest Africa 7576
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7576
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 277 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	Howardite
Recommended:			Howardite [explanation]

This is 1 of 451 approved meteorites classified as Howardite. [show all]
Search for other: Achondrites, HED achondrites, and Howardites

Comments:

Approved 1 Jan 2013

Writeup

Writeup from MB 102:

Northwest Africa 7576 (NWA 7576)

(Northwest Africa)

Purchased: 14 Dec 2011

Classification: HED achondrite (Howardite)

Petrography: Brecciated meteorite containing abundant diogenetic and subordinate coarse-grained basaltic eucrite clasts set in a fine-grained clastic matrix. Rarely dark cryptocrystalline melt clasts are encountered. Basaltic clasts are composed of exsolved pyroxene, calcic plagioclase and abundant silica polymorphs. Accessory minerals include troilite and chromite. Plagioclase and pyroxene display weak undulatory extinction due to low degree of shock metamorphism.

Geochemistry: Diogenitic orthopyroxene Fs_22.2-30.1Wo_1.3-4.6, FeO/MnO=22-33; low-Ca pyroxene host Fs_26.8-57.3Wo_2.7-6.5, FeO/MnO=26-33; augite exsolution lamellae Fs_28-28.2Wo_41.7-41.9, FeO/MnO=31-34; calcic plagioclase An_87.1, range An_76.8-93.

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Erfoud, Morocco
Date:	P 14 Dec 2011
Mass (g):	277
Pieces:	1
Class:	Howardite
Shock stage:	low
Weathering grade:	moderate
Ferrosilite (mol%):	22.2-30.1; 28-28.2
Wollastonite (mol%):	1.3-4.6; 41.7-41.9
Classifier:	A. Greshake, MNB
Type spec mass (g):	22.2
Type spec location:	MNB
Main mass:	Moritz Karl
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 Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Michael S. Scherman

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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