Plancheite

inosilicate

chrysocolla

Formula: Cu8(Si4O11)2(OH)4.H2O
Inosilicate (chain silicate)
Specific gravity: 3.4
Hardness: 5
Streak: Light blue
Colour: Pale to dark blue
Environments:

Hydrothermal environments

Plancheite is a rare secondary mineral in the oxidised portion of copper deposits, associated with chrysocolla, dioptase, malachite, conichalcite and tenorite (HOM).

At Table mountain mine, Pinal county, Arizona, USA, plancheite occurs with compact conichalcite (Dana).

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