Dioptase and Calcite Crystals on Matrix - NTS 013

Gemmy calcite and gemmy dioptase crystals on matrix

Measurements:  38 x 35 x 25 mm

Description:  Gemmy, small calcite crystals sit on gemmy dioptase crystals which, in turn, sit on a matrix of (?)quartz and calcite. The dioptase has a lovely bottle-green colour, more beautiful than in these images, and the specimen has a sparkle to it (seen when held in light), another difficult feature to portray in these images.

There is damage to some of the dioptase crystals on the edges of the specimen. The specimen displays well on a flat surface.

Weight of Specimen:  41.3 g

Chemical Composition:  Cu2+SiO2(OH)2  (dioptase)
                                         CaCO3  (calcite)

Hardness on Mohs Scale:  (dioptase)  5  
                                           (calcite)  3

Location:  Tsumeb, Northern Namibia.

Specimen Code:  NTS 013



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