Cancrisilite

cancrisilite

arfvedsonite

manaksite

eudialyte

Images

Formula: Na₇(Si₇Al₅)O₂₄(CO₃).3H₂O
Tectosilicate (framework silicate), cancrinite group, feldspathoid
Specific gravity: 2.40
Hardness: 5
Streak: White
Colour: Colourless, lilac, pale violet
Luminescence: Fluoresces bright yellow
Solubility: Dissolves readily with effervescence of CO₂ at 25^o in 10% in hydrochloric, nitric and sulphuric acids (Dana)
Common impurities: Ca,Mn,Fe,K,S
Environments

Pegmatites

Localities

At the type locality, Alluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia, cancrisilite occurs in ultra-agpaitic pegmatites in a differentiated alkalic massif. Associated minerals include K-feldspar, nepheline, sodalite, arfvedsonite, aegirine, manaksite, eudialyte and lamprophyllite (HOM).

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