Another image is available for Tuesday, April 9th, 2013
Dioptase with Quartz and Calcite
Dioptase is a copper cyclosilicate mineral with an often stunning green presentation. It forms trigonal crystals that terminate in rhombohedra. This specimen is from Africa, more specifically the Congo. From my personal collection. EOS 6D, EF 100 mm ƒ/2.8 macro: 1 second, ƒ/16, ISO 100, tripod, illumination was six 20w Xenon lamps. 10 sec shutter hold-off for stability.
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