Manganokukisvumite

manganokukisvumite

aegirine

natrolite

labuntsovite-Mn

Images

Formula: Na6MnTi4Si8O28.4H2O
Inosilicate (chain silicate), single chains, manganese- and titanium- bearing mineral
Crystal System: Orthorhombic
Specific gravity: 2.86 measured, 2.88 calculated
Hardness: 5½ to 6
Streak: White
Colour: Colourless
Luminescence: Not fluorescnt under UV
Environments

Hydrothermal environments

Localities

At the type locality, the Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada, manganokukisvumite formed late in the paragenesis but before the final zeolite phase, in small cavities in an albite-rich syenite breccia. It is associated with aegirine, microcline, albite, annite, pyrite, pyrrhotite, chalcopyrite, natrolite, calcite, a chlorite group mineral, magnetite, fluorapatite, elpidite, sodalite, labuntsovite-Mn and titanite. Manganokukisvumite likely formed through the hydrothermal dissolution of other titanium-bearing minerals, especially aegirine, which is strongly enriched in titanium in this association. Manganokukisvumite is very rare, occurring sparsely in the breccia cavities as extremely thin, flattened, sword-shaped crystals to 0.5 mm in length. It typically forms radiating, fan-shaped groups of crystals (CM 42.3.781-785).

Back to Minerals