Hydrous copper silicate (phyllosilicate/mineraloid) · Chrysocolla

Chrysocolla / Gem Silica

Chrysocolla spans two trades: soft sky-blue botryoidal copper silicate (stabilised for cabs and carvings) and hard vivid blue gem silica - chalcedony stained through by chrysocolla. The Chelsea filter and RI separate natural gem silica from dyed chalcedony imitations. Arizona and Peru supply the fine hard material.

Colour
blue

Transparency
Semi-transparent to opaque (variable)

RI
1.535–1.539

SG
2.55–2.70

Mohs
2.0–4.0

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Chrysocolla / Gem Silica

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