Dolerophanite

dolerophanite

chalcocyanite

euchlorine

eriochalcite

Images

Formula: Cu2O(SO4)
Anhydrous sulphate
Specific gravity: 4.17
Hardness: 3
Streak: Yellowish brown
Colour: Dark brown, nearly black, yellow-brown in transmitted light
Solubility: Slowly decomposed by cold water, leaving a blue solution and residue, also decomposed by moist air
Environments

Fumeroles

Dolerophanite is a secondary copper mineral in active volcanic fumaroles.

Localities

At the type locality, Mt Vesuvius, Somma-Vesuvius Complex, Naples, Campania, Italy, dolerophanite occurs as a sublimate in active volcanic fumaroles. Associated minerals include chalcocyanite, euchlorine and eriochalcite (HOM).

At the Tolbachik volcano, Kamchatka Krai, Russia, dolerophanite is associated with chalcocyanite, euchlorine, eriochalcite, vergasovaite, fedotovite, melanothallite, piypite, ponomarevite, cotunnite, sofiite, halite, sylvite, tenorite, copper-bearing anglesite and gold (HOM).

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