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Northwest Africa 7534
Basic information Name: Northwest Africa 7534
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7534
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 736 g
Meteoritical Bulletin:  MB 102  (2013)  H6-melt breccia
Recommended:  H6-melt breccia    [explanation]

This is 1 of 13 approved meteorites classified as H6-melt breccia.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 15 Apr 2013
Writeup from MB 102:

Northwest Africa 7534 (NWA 7534)


Purchased: Aug 2012

Classification: Ordinary chondrite (H6, melt breccia)

History: Purchased by Adam Bates from a Moroccan meteorite dealer, August 2012.

Physical characteristics: Single stone, dark, rough exterior. Sawn surface shows two distinct textures: melted and unmelted. Melted portion contains fine blebs of metal and sulfide, but some up to 3 mm, set in a microcrystalline groundmass. Umelted portion contains fine-grained metal/sulfide set in a dark, coarser crystalline groundmass.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows two main domains: 1) melted domain consisting of very fine-grained silicate quench crystals hosting scattered 50-100 μm, Mg-rich, olivine and pyroxene crystals, and metal and sulfide blebs, 2) unmelted H6 chondrite domain with a few equilibrated indistinct chondrules; ubiquitous plagioclase, kamacite, troilite, and chromite.

Geochemistry: (C. Agee and M. Spilde, UNM) Olivine Fa18.2±0.0, Fe/Mn=41±3, n=2; orthopyroxene Fs16.3±0.0Wo1.6±0.2, Fe/Mn=25±1, n=2.

Classification: H6-melt breccia, weathering grade W2.

Specimens: 21 g including a probe mount on deposit at UNM, Adam Bates holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P Aug 2012
Mass (g):736
Class:H6-melt breccia
Weathering grade:W2
Fayalite (mol%):18.2
Ferrosilite (mol%):16.3
Wollastonite (mol%):1.6±0.2
Classifier:C. Agee, UNM
Type spec mass (g):21
Type spec location:UNM
Main mass:Adam Bates
Comments:Submitted by C. Agee
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 1932 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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