Sazhinite-(Ce)

sazhinite-(Ce)

natrolite

steenstrupine

neptunite

Images

Formula: Na₃CeSi₆O₁₅.2H₂O
Phyllosilicate (sheet silicate), dalyite group, cesium-bearing mineral
Crystal system: Orthorhombic
Specific gravity: 2.61 measured, 2.80 calculated
Hardness: 2 to 3
Colour: Light grey, white, cream
Environments

Plutonic igneous environments
Pegmatites

Localities

At the Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada, sazhinite-(Ce) occurs in sodalite xenoliths in an intrusive alkalic gabbro-syenite complex, associated with vuonnemite, serandite, ussingite, sodalite and eudialyte (HOM).

At the type locality, the Yubileinaya pegmatite, Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia, sazhinite-(Ce) occurs as disseminations in natrolite and rims around altered steenstrupine in the alkalic pegmatite in the differentiated alkalic massif. Associated minerals include natrolite, steenstrupine and neptunite. Crystals are tabular to thick tabular, striated along their length, up to 1.5 cm long (HOM).
Sazhinite-(Ce) from the Yubileinaya pegmatite - Image

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