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Northwest Africa 7903
Basic information Name: Northwest Africa 7903
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7903
Observed fall: No
Year found: 2013
Country: Morocco
Mass:help 90 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 234 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 19 Jun 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7903 (NWA 7903)

Morocco

Purchased: 2013

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by Adam Aaronson in 2013.

Physical characteristics: Single stone, black fusion crust, saw cut reveals brecciated texture, a few cm-sized clasts and mm-sized pyroxene and plagioclase crystals set in a fine-grained, gray matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows evidence of shock with large (~1 mm), fractured, pyroxene and plagioclase grains set in a cataclastic groundmass. Most pyroxenes show exsolution lamellae. Silica-troilite domains throughout.

Geochemistry: (C. Agee and L. Burkemper, UNM) Low Ca-pyroxene Fs62.2±2.2Wo4.4±2.1, Fe/Mn=32±1, n=13; high-Ca pyroxene Fs29.7±01.3Wo42.4±0.7, Fe/Mn=31±1; n=8; plagioclase Or0.6±0.1Ab12.8±2.4An86.7±2.5, n=4.

Classification: Achondrite (Eucrite-mmict). Monomict based on the presence of a single compositional population of highly equilibrated low-Ca and high-Ca pyroxenes.

Specimens: 19.3 g including a probe mount on deposit at UNM, Aaronson holds the main mass.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2013
Mass (g):90
Pieces:1
Class:Eucrite-mmict
Ferrosilite (mol%):62.2±2.2, 29.7±01.3
Wollastonite (mol%):4.4±2.1, 42.4±0.7
Classifier:C. Agee, UNM
Type spec mass (g):19.3
Type spec location:UNM
Main mass:Aaronson
Comments:Submitted by C. Agee, UNM
Institutions
   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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1466 approved meteorites from Morocco (plus 21 unapproved names) (plus 1 impact crater)

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