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Northwest Africa 7197
Basic information Name: Northwest Africa 7197
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7197
Observed fall: No
Year found: 2009
Country: Morocco
Mass:help 1149 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  L3.8
Recommended:  L3.8    [explanation]

This is 1 of 68 approved meteorites classified as L3.8.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 8 Mar 2012
Writeuphelp
Writeup from MB 100:

Northwest Africa 7197 (NWA 7197)

Morocco

Purchased: 2009

Classification: Ordinary chondrite (L3.8)

History: Purchased by B. Reed in Tucson, 2009.

Physical characteristics: Cut surface shows gray matrix with some patches of red-brown oxidation, chondrules to 3mm, some rimmed by metal or sulfide.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows olivine, orthopyroxene, clinopyroxene, feldspathic mesostasis, BO, PO, POP chondrules, ubiquitous troilite, Fe-Ni metal, and weathered iron oxide.

Geochemistry: (C. Agee and N. Wilson, UNM) Olivine Fa25.6±4.3, Fe/Mn=59±16, n=37, low-Ca pyroxene Fs14.5±7.2Wo1.1±0.9, Fe/Mn=32±15, n=33, high-Ca pyroxene Fs20.1±3.1Wo27.2±7.9, Fe/Mn=32±3, n=5.

Classification: Ordinary chondrite (L3.8), subtype statistically based on olivine sigma of Fa=4.3 or PMD=15 (n=37) and low-Ca pyroxene sigma of Fs=7.2 or PMD=47 (n=33). Weathering grade W3.

Specimens: 25.1 g including a probe mount on deposit at UNM, Reed holds the main mass.

Data from:
  MB100
  Table 1
  Line 1667:
Place of purchase:Tucson
Date:P 2009
Mass (g):1148.5
Pieces:1
Class:L3.8
Weathering grade:W3
Fayalite (mol%):25.6±4.3
Ferrosilite (mol%):14.5±7.2
Wollastonite (mol%):1.1±0.9
Classifier:C. Agee, UNM
Type spec mass (g):25.1
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. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1505 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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