Allochalcoselite

allochalcoselite

cotunnite

sofiite

ilinskite

Images

Formula: Cu1+Cu2+5PbO2(SeO3)2Cl5
Selenite
Crystal System: Monoclinic
Specific gravity: 4.635 calculated
Hardness: 3 to 4
Colour: Dark brown
Environments

Fumeroles

Allochalcoselite was approved in 2004 but to date (May 2023) it has been reported only from the type locality.

Localities

At the type locality, the Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik volcano, Kamchatka Krai, Russia, allochalcoselite occurs as small prismatic crystals up to 0.1 mm long. formed by sublimation around a degassing volcanic fumarole. Associated minerals include cotunnite, sofiite, ilinskite, georgbokiite and burnsite (HOM, Mindat).

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