Vuonnemite

vuonnemite

lorenzenite

cancrinite

villiaumite

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Formula: Na₆Na₂Nb₂Na₃Ti(Si₂O₇)₂(PO₄)₂O₂(OF)
Sorosilicate (Si₂O₇ groups), lamprophyllite group, niobium and titanium bearing mineral
Crystal System: Triclinic
Specific gravity: 3.13 to 3.15 measured, 3.17 calculated
Hardness: 2 to 3
Streak: White
Colour: Light yellow to lemon-yellow, greenish yellow, light pink
Common impurities: Al,Nb,Fe,Mn,Mg,Ca,K
Environments

Plutonic igneous environments

Localities

At the Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Quebec, Canada, vuonnemite occurs in sodalite xenoliths in an intrusive alkalic gabbro-syenite complex (HOM).

At the Ilímaussaq complex, Kujalleq, Greenland, vuonnemite occurs in a transition zone between two nepheline syenites, with microcline, natrolite, epistolite, sodalite and villiaumite (HOM).

At the type locality, the Vuonnemiok River Valley, Khibiny Massif, Murmansk Oblast, Russia, vuonnemite occurs in albitised alkalic rocks as plates up to 1.8 X 1.5 y 0.15 cm. Associated minerals include albite, microcline, nepheline, aegirine, lorenzenite, cancrinite, serandite and villiaumite (AM 59.875).

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