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.



Click images to enlarge:

eucrite2224a.jpg (101443 bytes)  eucrite2224b.jpg (129978 bytes)  eucrite2224c.jpg (176568 bytes)  eucrite2224d.jpg (178302 bytes)

eucrite2224e.jpg (189896 bytes)  eucrite2224f.jpg (180514 bytes)  eucrite2224g.jpg (175140 bytes)

dscn7600.jpg (161930 bytes)  dscn7601.jpg (369218 bytes)

Endcut (sold) weighs 456 grams. Cut face measures 133mm by 85mm:

Eucrite 1.jpg (161140 bytes)  Eucrite 2.jpg (149055 bytes)


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