Burnsite

burnsite

chloromenite

georgbokiite

cotunnite

Formula: KCdCu7O2(SeO3)2Cl9
Selenite
Specific gravity: 3.85
Hardness: 1 to 1½
Streak: Red
Colour: Dark red
Environments

Fumeroles

Burnsite is a very rare cadmium and selenium bearing mineral, to date (February 2022) known only from its type locality.

Localities

The type locality is the second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik volcano, Kamchatka Krai, Russia. The burnsite occurs in a fumerole as isometric grains, up to 0.1 mm, formed at an estimated 450oC to 500oC. Associated minerals include cotunnite, sofiite, ilinskite, georgbokiite and chloromenite (HOM, Minrec 35.2.175).

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