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Northwest Africa 7658
Basic information Name: Northwest Africa 7658
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7658
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 109 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  L3.5
Recommended:  L3.5    [explanation]

This is 1 of 95 approved meteorites classified as L3.5.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 5 Feb 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7658 (NWA 7658)

Morocco

Purchased: Aug 2012

Classification: Ordinary chondrite (L3.5)

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

Physical characteristics: Single stone with dark weathered exterior. Saw cut reveals many densely packed chondrules of variable size, moderately iron stained.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous unequilibrated PO, POP, BO chondrules, range ~200-2000 μm, ubiquitous troilite, most metal weathered to Fe-oxide.

Geochemistry: (C. Agee and L. Burkemper, UNM) Olivine Fa22.1±8.7, Fe/Mn=54±16, Cr2O3=0.10±0.14 wt%, n=28; low-Ca pyroxene Fs9.6±7.4Wo0.9±0.8, Fe/Mn=25±21, n=34.

Classification: Ordinary chondrite (L3.5), mean Fa-content and sigma consistent with type 3.5, low-Ca pyroxene has anomalously low mean Fs-content and high sigma for type 3.5, weathering grade W3.

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

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P Aug 2012
Mass (g):109
Pieces:1
Class:L3.5
Weathering grade:W3
Fayalite (mol%):22.1±8.7
Ferrosilite (mol%):9.6±7.4
Wollastonite (mol%):0.9±0.8
Classifier:C. Agee
Type spec mass (g):21
Type spec location:UNM
Main mass:Adam Bates
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1847 approved meteorites from Morocco (plus 24 unapproved names) (plus 1 impact crater)

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