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