Dioptase: an emerald-green to blue-green gemmy mineral species The mineral species Dioptase is a trigonal cyclosilicate, CuSiO3 · H2O. Cyclosilicates belong to the larger class of silicate minerals.

Azurite: a fascinating mineral species

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Azurite: a fascinating mineral species
Beryl: an exceptional gemmy mineral species

Pseudomorphs and variations

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Pseudomorphs and variations
Vanadinite: a very colourful mineral species
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