Yurmarinite

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Formula: Na₇(Fe³⁺,Mg,Cu)₄(AsO₄)₆
Anhydrous arsenate
Crystal System: Trigonal
Specific gravity: 4.00 calculated
Hardness: 4½
Streak: White
Colour: Pale green or pale yellowish green to colourless
Environments

Fumeroles

Yurmarinite is a relatively new mineral, approved in 2014 and to date reported only from the type locality.

Localities

At the type locality, the Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia, yurmarinite is associated with hatertite, bradaczekite, johillerite, hematite, tenorite, tilasite and aphthitalite. Yurmarinite occurs as well-shaped, equant crystals up to 0.3 mm in size, their clusters up to 0.5 mm and thin, interrupted crystal crusts up to 3 mm × 3 mm on basaltic scoria (MM 78.4.905-917).

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