NWA 7678 (57,253 g)

Northwest Africa 7678 (NWA 7678)
Morocco
Purchased: 2012 Aug
Classification: Carbonaceous chondrite (CV3)
History: Purchased by Adam Bates from a meteorite dealer in Morocco, August 2012.
Physical characteristics: 182 matching individuals/fragments, main mass 581 g. Dark weathered exterior, saw-cut reveals many small chondrules less than 1 mm and a few up to 5 mm, scattered CAIs up to 1 cm, set in a dark gray groundmass.
Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a numerous AOA, BO, PO, POP, and PP chondrules, most in the size range 300-1000 μm, in very fine-grained matrix. Abundant troilite; nearly all iron metal is oxidized by weathering.
Geochemistry: (C. Agee and M. Spilde, UNM) Chondrule olivine range: Fa0.7-63.1, n=31. Type I chondrules: olivine Fa 3.0±1.9, Fe/Mn=49±31, Cr2O3=0.14±0.09, n=26; low-Ca pyroxene Fs2.0±1.6Wo1.3±0.9, Fe/Mn=25±20, n=23. Type II chondrules: olivine Fa 40.3±26.4, Fe/Mn=133±53, Cr2O3=0.08±0.04, n=5. Fassaite Fs5.1±0.6Wo58.4±1.2, Al2O3=23.69±0.14 wt%, Na2O=2.65±0.00 wt%, n=2.
Classification: Carbonaceous chondrite (CV3)
Specimens: 65 g including a probe mount on deposit at UNM, Adam Bates holds the main mass.
 
Place of purchase: Morocco
Date: P 2012 Aug
Mass (g): 4236
Pieces: 182
Class: CV3
Fayalite (mol%): 0.7-63.1
Ferrosilite (mol%): 2.0±1.6
Wollastonite (mol%): 1.3±0.9
Classifier: C. Agee, UNM
Type spec mass (g): 65
Type spec location: UNM
Main mass: Adam Bates
Comments: Submitted by C. Agee