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Northwest Africa 090
Basic information Name: Northwest Africa 090
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 090
Observed fall: No
Year found: 2000
Country: (Northwest Africa)
Mass:help 30 g
Meteoritical Bulletin:  MB 105  (2016)  Acapulcoite
Recommended:  Acapulcoite    [explanation]

This is 1 of 93 approved meteorites classified as Acapulcoite.   [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites
Comments: Approved 3 Dec 2016
Writeup from MB 105:

Northwest Africa 090 (NWA 090)

(Northwest Africa)

Purchased: 2000

Classification: Primitive achondrite (Acapulcoite)

History: A 30 g meteorite was purchased by Michael Farmer from a Moroccan meteorite dealer in Erfoud, Morocco, in 2000.

Physical characteristics: A rounded stone covered by a well-developed fusion crust. Interior is fine grained with even distribution of small metal and troilite grains.

Petrography: (C. Ostrander, Z. Torrano, ASU) Proto-granular texture dominated by pyroxene, olivine, Fe-Ni metal, and troilite. Uniform grain size near 200 μm. Section shows several rounded mineral aggregates (~400 μm). The rounded aggregates are dominated by pyroxene, one with a radial texture. Holly-leaf-shaped Fe-Ni metal grains, some peppered with sub-μm inclusions. Fe-Ni metal distribution is not homogeneous. Troilite dominantly single crystal, showing uneven distribution with metal. Crystals typically and lacking 120º junctions. Shock is low.

Geochemistry: Olivine Fa6.1±0.3, FeO/MnO = 10.7-15.4, Cr2O3 = 0.01-0.07 wt.%, n=4; low Ca pyroxene Fs7.3±0.3Wo1.2±0.3, FeO/MnO = 7.9-14.0, n=4; high Ca pyroxene Fs3.4±0.2Wo45.9±0.2, n=5; and, plagioclase An12.7±0.2Or5.4±0.1, n=5. Accessory chromite, Cr/[Cr+Al] = 0.89-0.91.

Classification: Acapulcoite, medium weathering, low shock

Specimens: 12.6 g, one polished thin section and a polished thick section are on deposit at ASU.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2000
Mass (g):30.0
Shock stage:low
Weathering grade:medium
Fayalite (mol%):6.1±0.3 (n=4)
Ferrosilite (mol%):7.3±0.3 (n=4)
Wollastonite (mol%):1.2±0.3 (n=4)
Classifier:C. Ostrander, Z. Torrano, ASU
Type spec mass (g):12.6
Type spec location:ASU
Main mass:MFarmer
Comments:Submitted by L. Garvie
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 9729 approved meteorites from (Northwest Africa) (plus 1859 unapproved names)

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