NWA 2650

Northwest Africa
Purchased 2004
Achondrite (cumulate eucrite)

A 2224 g complete stone that measures 189 mm x 112 mm x 82 mm at the widest points, with fresh crust was purchased in Erfoud, Morocco, Description and classification (T. Bunch and J. Wittke, NAU): cataclastic, cumulate eucrite; coarse-grained (plagioclase up to 7 mm and pyroxenes to 5 mm); zones of intense crushing with minor recrystallization; discontinuous melt veins and pockets. Plastic deformation and offset faulting in plagioclase; minor amounts of maskelynite; undulatory extinction, shock twinning, and reduced birefringence in pyroxenes; shock level, S3-5. Extensive development of albite, Carlsbad, and complex igneous twinning in plagioclase. Exsolution lamellae of subcalcic augite (Fs52.5Wo15.9) in inverted ferrohypersthene (Fs61.1Wo3.8) and separate grains of augite (Fs25.1Wo45.7), FeO/MnO of all pyroxenes between 32.2 and 34.8. Plagioclase, An90.8 and minor amounts of ilmenite and chromite, cr# = 68-75.  Low weathering grade. Specimens: type specimen, 23.1 g, NAU; main mass, D. Schultz.

 

Photos of the main mass before cutting.
NWA 2650, 1: 14.43 gram partslice. $360.00	NWA 2650, 2: 12.96 gram partslice. $324.00
NWA 2650, 3: 12.09 gram partslice. $300.00	NWA 2650, 4: 11.14 gram partsliceslice. $275.00
NWA 2650, 5: 11.01 gram partslice. $275.00	NWA 2650, 6: 6.51 gram partslice. $162.00