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Northwest Africa 7900
Basic information Name: Northwest Africa 7900
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7900
Observed fall: No
Year found: 2013
Country: Morocco
Mass:help 899 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  LL6
Recommended:  LL6    [explanation]

This is 1 of 2788 approved meteorites (plus 1 unapproved name) classified as LL6.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 3 Jun 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7900 (NWA 7900)

Morocco

Purchased: 2013

Classification: Ordinary chondrite (LL6)

History: Purchased by Blaine Reed in Tucson, 2013.

Physical characteristics: Single stone, weathered black fusion crust, saw cut reveals breccia, with many dark angular clasts, up to ~1-cm, set in light-gray, fine-grained matrix, some oxidized.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous texturally equilibrated clasts set in a brecciated, cataclastic matrix. Accessory high-Ca pyroxene, chromite, troilite, and Fe,Ni metal.

Geochemistry: (C. Agee and L. Burkemper, UNM) Groundmass: olivine Fa32.1±0.2, Fe/Mn=60±2, n=6; low-Ca pyroxene Fs25.2±0.2Wo1.9±0.1, Fe/Mn=38±2, n=5; clasts: olivine Fa31.8±0.3, Fe/Mn=64±1, n=6; low-Ca pyroxene Fs25.2±0.6Wo2.0±0.1, Fe/Mn=37±1, n=5.

Classification: Ordinary chondrite (LL6), monomict breccia, although the clasts and groundmass are texturally distinct, they are geochemically identical based on olivine and pyroxenes compositions, weathering grade W2.

Specimens: 35.4 g including a probe mount on deposit at UNM, Reed holds the main mass.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2013
Mass (g):899.4
Pieces:1
Class:LL6
Weathering grade:W2
Fayalite (mol%):32.1±0.2, 31.8±0.3
Ferrosilite (mol%):25.2±0.2, 25.2±0.6
Wollastonite (mol%):1.9±0.1, 2.0±0.1
Classifier:C. Agee, UNM
Type spec mass (g):35.4
Type spec location:UNM
Main mass:Reed
Comments:Submitted by C. Agee
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)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)
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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