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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:help 277 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 453 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 1 Jan 2013
Writeuphelp
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 Fs22.2-30.1Wo1.3-4.6, FeO/MnO=22-33; low-Ca pyroxene host Fs26.8-57.3Wo2.7-6.5, FeO/MnO=26-33; augite exsolution lamellae Fs28-28.2Wo41.7-41.9, FeO/MnO=31-34; calcic plagioclase An87.1, range An76.8-93.

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
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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