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Northwest Africa 7181
Basic information Name: Northwest Africa 7181
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7181
Observed fall: No
Year found: 2011
Country: Morocco
Mass:help 543 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  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 2 Mar 2012
Writeuphelp
Writeup from MB 100:

Northwest Africa 7181 (NWA 7181)

Morocco

Purchased: 2011

Classification: Ordinary chondrite (L3.5)

History: Purchased by Matt Morgan at the Denver Gem and Mineral Show, 2011.

Physical characteristics: Dark brown exterior, some iron staining, saw cut shows numerous small chondrules set in dark matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous unequilibrated chondrules, RP, POP, some ringed with sulfide, variable sizes, up to 2 mm. Albitic mesostasis and glass. Most metal is oxidized, abundant weathering veinlets.

Geochemistry: (C. Agee and N. Wilson, UNM) Olivine Fa22.8±5.1, range Fa5-30, PMD=21%, Fe/Mn=59±21, n=32. Orthopyroxene Fs11.4±7.6Wo0.9±1.3, range Fs3-29, PMD=62%, Fe/Mn=27±10, n=28.

Classification: Ordinary chondrite L3.5 Subtype estimate based on standard deviation of olivine and pyroxene. Weathering grade: W3.

Specimens: 20 g on deposit at UNM. MtMorgan holds the main mass.

Data from:
  MB100
  Table 1
  Line 1662:
Place of purchase:Denver Gem and Mineral Show
Date:P 2011
Mass (g):543
Pieces:1
Class:L3.5
Weathering grade:W3
Fayalite (mol%):22.8±5.1
Ferrosilite (mol%):11.4±7.6
Wollastonite (mol%):0.9±1.3
Classifier:C. Agee
Type spec mass (g):20
Type spec location:UNM
Main mass:MtMorgan
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)
MtMorgan: Matt Morgan, Mile High Meteorites, P.O. Box 151293, Lakewood, CO 80215-9293, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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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