Bolotinaite

bolotinaite

sanidine

nepheline

zircon

Images

Formula: (Na₇☐)(Al₆Si₆O₂₄)F.4H₂O
Tectosilicate (framework silicate), sodalite group
Crystal System: Isometric
Specific gravity: 2.27 measured, 2.291 calculated
Hardness: 5
Streak: White
Colour: Pale yellow to pinkish
Luminescence: weak, orange-yellow, LWUV, due to trace S2•– radical anion
Environments

Volcanic igneous environments

Bolotinaite is a new mineral, approved in 2021 and to date (February 2023) reported only from the type locality.

Localities

At the type locality, In den Dellen quarries, Mendig, Mendig, Mayen-Koblenz District, Rhineland-Palatinate, Germany, bolotinaite was discovered in a volcanic ejectum of trachitoid sanidine-bearing rock collected from the quarry. The associated minerals are sanidine, nepheline, annite and zircon. Bolotinaite occurs as pale yellow to pinkish coloured isolated interpenetration prismatic twins up to 1.3 mm long, complex twins, and rare non-twinned rhombic dodecahedra up to 0.2 mm across (MM 86.920-928).

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