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Northwest Africa 7546
Basic information Name: Northwest Africa 7546
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7546
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 128 g
Classification
  history:
Meteoritical Bulletin:  MB 101  (2012)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 386 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 12 Dec 2012
Writeuphelp
Writeup from MB 101:

Northwest Africa 7546 (NWA 7546)

(Northwest Africa)

Purchased: 2012

Classification: HED achondrite (Howardite)

Petrography: Grayish breccia dominated by diogenitic clasts of blocky orthopyroxene, partly showing compositional zoning (i.e., Mg-rich core to Fe-rich rim) and large Ca-rich plagioclase. More rarely small basaltic eucrite clasts composed of exsolved Ca-pyroxene and lath-shaped calcic plagioclase. In both lithologies Ca-rich plagioclase has been partly to completely converted into maskelynite. Minor mineral phases include chromite, ilmenite, troilite, and silica polymorphs.

Geochemistry: Diogenitic orthopyroxene Fs28-41.2Wo1.2-3.4, FeO/MnO=31-40; low-Ca pyroxene host Fs42.3-62.8Wo2.2-5.3, FeO/MnO=28-32; augite exsolution lamellae Fs15.4-30.5Wo40.7-44.5, FeO/MnO=24-32. Calcic plagioclase An87, range 61.5-93

Data from:
  MB101
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2012
Mass (g):128
Pieces:1
Class:Howardite
Shock stage:strong
Weathering grade:moderate
Ferrosilite (mol%):28-41.2; 42.3-62.8
Wollastonite (mol%):1.2-3.4, 2.2-5.3
Classifier:Ansgar Greshake, MNB
Type spec mass (g):37.6
Type spec location:MNB
Main mass:Philippe Schmitt-Kopplin
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. 101, MAPS 50, 1661, September 2015
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7483 approved meteorites from (Northwest Africa) (plus 1994 unapproved names)

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