Dioptase : CuSiO3·H2O, Quartz (Var: Rose Quartz) : SiO2, Cristobalite : SiO2

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minID: WMT-K8T

Dioptase : CuSiO3·H2O, Quartz (Var: Rose Quartz) : SiO2, Cristobalite : SiO2

This image is copyrighted. Unauthorized reproduction prohibited.

Crystal of dioptase with lenght about 0.06 mm is sitting on the surface of cristobalite matrix. Crystal is situated in the middle of the photo and looks brighter than surrounding matrix because detector of backscattered electrons providing contrast between areas with different chemical composition was used. Identity of dioptase is confirmed with energy-dispersive x-ray spectroscopy (EDS). In optical photographs (they will be added later) crystal has emerald-greeen colour. In the lower left corner of the photo there is large (more than 1 mm) chipped crystal of rose quartz (or to be more precise pink quartz, because its colour is related to presense of aluminium - confirmed with EDS).
Sample is obtained from American collector Jeremy Fuller, who self-collected it in 2010 together with his business partner John Holfert known for discovery of new mineral holfertite. Overall dimensions of the sample are 25 x 25 mm. Sample hosts at least 4 crystals of dioptase (initially there were more crystals, but several of them were destroyed as a result of inaccurate handling).
Photo is obtained using low-vacuum scanning electrone microscope JSM-5610 LV (JEOL, Japan) without coating of the sample.
Dmitry Stepanenko collection.

This photo has been shown 367 times
Photo added:2nd Feb 2013
Dimensions:640x480px (0.31 megapixels)

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