Ilinskite

ilinskite

cotunnite

sofiite

moissanite

Formula: NaCu5O2(Se4+O3)2Cl3
Selenite
Specific gravity: 4.08 calculated
Hardness: 1½
Streak: Light green
Colour: Emerald green
Environments

Fumeroles

Localities

To date (February 2021) ilinskite is known only from its two co-type localities, the second scoria cone, Northern Breakthrough, Great Fissure eruption, and the Glavnoye fumarole, Southern Breakthrough, Great Fissure eruption, both at the Tolbachik volcano, Kamchatka Krai, Russia. It is a product of fumarole activity and is present in exhalative deposits where the temperature is 200 to 230oC. It forms single crystals and sheath-like aggregates, associated with cotunnite, sofiite, halite, gold, tolbachite, melanothallite, chalcocyanite, burnsite, georgbokiite and chloromenite. It occurs on a scoria-like substrate of amorphous aluminium-magnesium-sodium sulphates containing finely dispersed iron oxides, galena, moissanite and possible native aluminium (AM 83.186, HOM)

Back to Minerals