Bradaczekite

bradaczekite

lammerite

urusovite

johillerite

Images

Formula: NaCuCuCu2(AsO4)3
Anhydrous normal arsenate, alluaudite group
Streak: Light blue to white
Colour: Dark blue
Environments

Fumeroles

Bradaczekite is a rare mineral that to date (January 2022) has been found only at the Tolbachik volcano.

Localities

The type locality is the second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik volcano, Kamchatka Krai, Russia. This eruption is the largest basaltic eruption in more than 200 years. Beginning in the late 1970s, fumarolic activity here resulted in a unique assemblage of minerals, with two dozen new species discovered by 2001. Bradaczekite was found in a fumerole as aggregates of dark blue plates, closely associated with hematite, tenorite, lammerite, urusovite, orthoclase and johillerite, and intergrowths with urusovite and johillerite are common. The size of individual grains is about 0.2 mm in length and about 0.1–0.2 mm across (CM 39: 1115-1119).

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