Organovaite-(Mn)

organovaite-(Mn)

vuoriyarvite-K

kuzmenkoite-Mn

calciohilairite

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Formula: K2MnNb4(Si4O12)2O4.5-7H2O
Cyclosilicate (ring silicate), organovaite group
Specific gravity: 2.88 measured, 2.92 calculated
Hardness: 5
Streak: White
Colour: Pinkish in various shades, rose-brown, yellow-brown
Environments

Pegmatites

Organovaite-(Mn) occurs in alkaline pegmatites. It sometimes forms pseudomorphs after vuonnemite.

Localities

At the type locality, Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia, organovaite-(Mn) occurs as stubby prismatic crystals, up to 0.3 × 0.2 mm, and as pseudomorphs after crystals of vuonnemite, up to 4 cm. Associated minerals include microcline, albite, aegirine, arfvedsonite, eudialyte, sodalite, natrolite, elpidite, cristobalite, steenstrupine-(Ce), rhabdophane-(Ce) and yofortierite (AM 87.1734).

At Selsurt Mountain (Flora Mountain), Lovozersky District, Murmansk Oblast, Russia, organovaite-(Mn) occurs as crystals to 0.5 mm, associated with calciohilairite, natrolite, albite, aegirine, vuoriyarvite-K and kuzmenkoite-Mn (AM 87.1734).

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