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Northwest Africa 7781
Basic information Name: Northwest Africa 7781
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7781
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 647 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  L4
Recommended:  L4    [explanation]

This is 1 of 1646 approved meteorites (plus 4 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 3 Apr 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7781 (NWA 7781)

Morocco

Purchased: 2012

Classification: Ordinary chondrite (L4)

History: Purchased by Sean Tutorow from a Moroccan meteorite dealer in 2012.

Physical characteristics: Single stone, brown exterior, saw cut reveals small metal grains set in light-brown matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a few PO, POP chondrules, some coarse-grained olivines in shock-melt, plagioclase up to 100 μm.

Geochemistry: (C. Agee and L. Burkemper, UNM) Olivine Fa25.6±1.6, Fe/Mn=49±5, n=5; low-Ca pyroxene Fs21.6±1.7Wo1.5±0.2, Fe/Mn=31±1, n=4.

Classification: Ordinary chondrite (L4), weathering grade W2.

Specimens: 38.1 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2012
Mass (g):646.90
Pieces:1
Class:L4
Weathering grade:W2
Fayalite (mol%):25.6±1.6
Ferrosilite (mol%):21.6±1.7
Wollastonite (mol%):1.5±0.2
Classifier:C. Agee, UNM
Type spec mass (g):38.1
Type spec location:UNM
Main mass:Sean Tutorow
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 1460 approved meteorites from Morocco (plus 21 unapproved names) (plus 1 impact crater)

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