Revdite

revdite

ussingite

villiaumite

kogarkoite

Images

Formula: Na₁₆Si₁₆O₂₇(OH)₂₆.28H₂O
Inosilicate (chain silicate)
Crystal System: Monoclinic
Specific gravity: 1.94 measured, 1.93 calculated
Hardness: 2
Colour: Colourless, white
Solubility: Dissolves slowly in room water at room temperature, and quickly in cold dilute acids
Environments

Plutonic igneous environments

Localities

At the Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Quebec, Canada, revdite occurs in sodalite xenoliths in syenite in the intrusive alkalic gabbro - syenite complex. Associated minerals include ussingite, villiaumite, kogarkoite, lovozerite and eudialyte (HOM).

At the type locality, Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia, revdite occurs as irregular rounded deposits up to 2 cm in diameter in ussingite veinlets cutting nepheline syenites in deep workings (AM 67.1074-1082).

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