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Northwest Africa 15102
Basic information Name: Northwest Africa 15102
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15102
Observed fall: No
Year found: 2008
Country: Morocco
Mass:help 20.6 g
Recommended:  CV3    [explanation]

This is 1 of 592 approved meteorites (plus 1 unapproved name) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 23 Jul 2022
Writeup from MB 111:

Northwest Africa 15102 (NWA 15102)


Purchased: 2008

Classification: Carbonaceous chondrite (CV3)

History: Meteorite was purchased in 2008 from Adam Aaronson at the Tucson mineral show who acquired it from Morocco. Sample is catalogued at ROM as M58731.

Physical characteristics: Two small complete individuals with partial dark fusion crust coverage and strongly pitted broken surfaces. All surfaces have moderate desert polish. Broken surfaces show 0.5 to 1 mm chondrules in relief. Physical properties: Magnetic susceptibility measured for a 10.6 g stone is log χ (× 10-9 m3/kg) = 3.52.

Petrography: Cut faces (9 cm2) reveal well spaced and defined chondrules and some irregular CAIs in a dark grey, porous matrix. No metal is apparent. In polished thin section, well defined chondrules of PO, GO, POP as well as lesser BO, RP and CC types (33 vol%), along with 9 vol% calcium-aluminum inclusions (CAIs), 6 vol% amoeboid olivine aggregates (AOAs), and 7 vol% opaque phases are set within a dark matrix (45 vol%). Chondrule mesostases are typically microcrystalline and dark. Chondrule diameters average 501±248 µm (n=30), with one chondrule 1.96 mm. CAIs range in size from 0.23 mm to 3.86 mm (average 1.2 mm). Olivine grains exhibit sharp to undulatory extinction. Phyllosilicate is absent. In reflected light and BSE images, AOAs contain abundant blebby troilite grains. Matrix olivine grains exhibit subtle zoning to Fe rich rims. Ca-poor pyroxene grains of uniform composition poikioliticaly enclose rounded, zoned olivine grains in abundant POP chondrules. Some chondrules contain round magnetite aggregates of 10-50 µm diameter, often associated with or containing small, resorbed FeNi metal grains. Accessory phases in the porous matrix are chromite and apatite.

Geochemistry: EPMA: Olivine Fa23.42±18.24 (n=31), chondrule olivine Fa15.09±14.62 (n=22), matrix olivine Fa43.80±5.30 (n=9), matrix olivine NiO wt% = 0.07±0.03; Ca-poor pyroxene Fs1.31±0.62Wo0.81±0.25 (n=16); Ca-rich pyroxene Fs0.93±0.44Wo43.80±10.62 (n=15). Magnetite composition key elements (all wt%): Cr2O3=1.42±0.39, TiO2=0.06±0.03, Al2O3=0.97±0.22, NiO=0.07±0.04 (n=21).

Classification: Carbonaceous chondrite: CV3 low shock, W1. CAI abundance, variation in matrix olivine compositions, low NiO2 content in olivine, and magnetite compositions are consistent with CV3 chondrite.

Specimens: Type specimen location: ROM. Main mass: DGregory.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, AZ, USA
Date:P 2008
Mass (g):20.61
Shock stage:low
Weathering grade:low
Fayalite (mol%):23.42±18.24
Ferrosilite (mol%):24.57±1.17, 10.58±1.18
Wollastonite (mol%):1.80±0.55, 43.17±1.81
Magnetic suscept.:3.52
Classifier:P. McCausland, ROM, UWO; C. Beros, ROM
Type spec mass (g):4.2
Type spec location:ROM
Main mass:DGregory
Comments:Submitted by V. Di Cecco, ROM
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 2015)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 1887 approved meteorites from Morocco (plus 26 unapproved names) (plus 1 impact crater)

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