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Northwest Africa 8690
Basic information Name: Northwest Africa 8690
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8690
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 227 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-cm
Recommended:  Eucrite-cm    [explanation]

This is 1 of 44 approved meteorites classified as Eucrite-cm.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 21 Dec 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8690 (NWA 8690)

Morocco

Purchased: 2014 Apr 22

Classification: HED achondrite (Eucrite, cumulate)

History: The stone was bought by R. Lenssen from a Moroccan meteorite dealer in Agadir in 2014

Physical characteristics: A single stone, almost fully covered by fresh fusion crust, showing regmaglypts. Cut surface reveals a light gray interior with a few cm-sized, slightly lighter clasts

Petrography: Igneous rock with cumulate texture. Typical grain size 500 μm to 1 mm. Main minerals are orthopyroxene with augite exsolution and plagioclase. Sulfide, chromite, and silica polymorphs are present. Rare metal.

Geochemistry: Pyroxenes: orthopyroxene Fs37.3±0.3Wo1.9±0.1 (N=4), augite exsolution Fs13.8±0.2Wo45.5±0.4 (N=2), FeO/MnO=27.1±2.6 (N=6). Plagioclase An89.6Ab10.0Or0.3 (N=3). Chromite Cr/(Cr+Al)= 0.83. Magnetic susceptibility log χ = 2.95 (χ in 10-9 m3/kg).

Classification: Eucrite-cm (brecciated)

Specimens: 25 g at CEREGE. Main mass with R. Lenssen

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Agadir, Morocco
Date:P 2014 Apr 22
Mass (g):227
Pieces:1
Class:Eucrite-cm
Weathering grade:minimal
Ferrosilite (mol%):37.3±0.3
Wollastonite (mol%):1.9±0.1
Magnetic suscept.:2.95
Classifier:J. Gattacceca, CEREGE
Type spec mass (g):25
Type spec location:CEREGE
Main mass:R. Lenssen
Comments:Submitted by J. Gattacceca
Institutions
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1402 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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