Nordite-(Ce)

nordite-(Ce)

lueshite

nordite

natrolite

Formula: Na₃SrCeZnSi₆O₁₇
Phyllosilicate (sheet silicates), nordite group
Crystal System: Orthorhombic
Specific gravity: 3.43 to 3.49 measured, 3.643 calculated
Hardness: 5
Streak: Light brown
Colour: Light brown, dark brown to black
weakly RADIOACTIVE
Environments:

Pegmatites

Nordite is extremely rare in sodalite syenite pegmatites (Webmin, HOM).

Localities

At Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Quebec, Canada, nordite-(Ce) is associated with lueshite (Dana).

At the Jubilee pegmatite, Karnasurt Mountain, Lovozero Massif, Murmansk Oblast, Russia, nordite-(Ce) occurs in natrolite in the central zone of the pegmatite (Dana).

At the type locality, Pegmatite No. 66, Motchisuai River Valley, Sengischorr Mountain, Lovozersky District, Murmansk Oblast, Russia, nordite-(Ce) occurs in a sodalite syenite pegmatite (Dana).

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