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Formula: Cu9O2(Se4+O3)4Cl6
Selenite
Crystal System: Monoclinic
Specific gravity: 4.15 calculated
Hardness: 1½ to 2½
Streak: Yellowish green
Colour: Tobacco green
Environments
Volcanic igneous environments
Fumerole
Localities
At the type locality, the Novaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik volcano,
Kamchatka Krai, Russia, chloromenite formed in the volcanic fumarole. Associated minerals include
melanothallite, sofiite,
georgbokiite, ilinskite,
burnsite and cotunnite
(HOM).
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