Specific gravity: 4.17
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
Dolerophanite is a secondary
copper mineral in active volcanic fumaroles.
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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