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Northwest Africa 7686
Basic information Name: Northwest Africa 7686
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7686
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 3.15 kg
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 630 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 1 Mar 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7686 (NWA 7686)

Morocco

Purchased: 2012 Aug

Classification: Ureilite

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

Physical characteristics: Single stone, weathered, irregular, dark exterior, saw cut reveals dark gray mosaic of olivine and pyroxene crystals, with scattered, fine-grained metal/oxide.

Petrography: (C. Agee, UNM) SEM examination of a polished mount shows approximately 60% olivine, 40% pigeonite, texturally equilibrated with triple junctions, grain size 300-800 μm. Most olivines zoned with forsteritic rims, grain boundaries occupied with metal that has been oxidized.

Geochemistry: (C. Agee and L. Burkemper, UNM) Olivine Fa8.3±2.2, Fe/Mn=16±5, Cr2O3=0.75±0.27 wt%, CaO=0.38±0.06 wt%, n=8; pigeonite Fs8.4±0.5Wo7.2±0.2, Fe/Mn=15±3, n=6.

Classification: Ureilite, based on presence of pigeonite, and Cr2O3 and CaO content in olivine, and Fe-Mg zonation of olivine.

Specimens: 25 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 2012 Aug
Mass (g):3146
Pieces:1
Class:Ureilite
Fayalite (mol%):8.3±2.2
Ferrosilite (mol%):8.4±0.5
Wollastonite (mol%):7.2±0.2
Classifier:C. Agee, UNM
Type spec mass (g):25
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 1973 approved meteorites from Morocco (plus 37 unapproved names) (plus 1 impact crater)

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