THE TWINNINGS AND ORIENTATION OF CUBANITE AND CHALCOPYRITE FROM OMINE, IWATE PREFECTURE
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概要
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The common pseudo-hexagonal polysynthetic twinning of cubanite will occur when cubic cubanite crystallizes at the temperature higher than about 220°C and transforms to the orthorhombic low form as lowering of temperature. The twinnings of cubanite and coexisting chalcopyrite of Omine mine were examined by x-ray single crystal diffraction methods. Some cubanite crystals (sample nos. 24 and 9) were single crystals containing small amount of chalcopyrite lamellae with {112} polysynethetic twinnings. The other common cubanites, which occur as narrow lamellae in the chalcopyrite host, had polysynthetic caxis rotation twinnings, and the chalcopyrite had {110} contact polysynthetic twinnings. Cubanite without twinning is considered to have been crystallized initially as the low orthorhombic form.
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