Gutkovaite-Mn

gutkovaite-Mn

arfvedsonite

chabazite

manganoneptunite

Images

Formula: CaK₂Mn(Ti,Nb)₄(Si₄O₁₂)₂(O,OH)₄.5H₂O
Cyclosilicate (ring silicate), gutkovaite group, labuntsovite supergroup
Crystal System: Monoclinic
Specific gravity: 2.83 measured, 2.70 calculated
Hardness: 5
Streak: White
Colour: Pale yellowish pink
Environments

Pegmatites

Gutkovaite-Mn is a comparatively new mineral, approved in 2002.

Localities

At the type locality, Maly Mannepakhk Mt, Khibiny Massif, Murmansk Oblast, Russia, gutkovaite-Mn occurs in a pegmatite in nepheline syenite. Associated minerals include microcline, aegirine, arfvedsonite, nepheline, eudialyte, albite, lorenzenite, loparite, aenigmatite, manganoneptunite, murmanite, analcime, natrolite, stilbite, chabazite, kuzmenkoite-Mn and nontronite (CM 41.811).

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