Nordite

minerals

belovite

neptunite

lomonosovite

Formulae:
nordite-(Ce): Na3SrCeZnSi6O17
nordite-(La): Na3SrLaZnSi6O17
Phyllosilicates (sheet silicates), nordite group
Hardness: Ce 5 La 5 to 6
Streak: Light brown
Colour: Light brown, dark brown to black
weakly RADIOACTIVE
Environments:

Pegmatites

Nordite is extremely rare in sodalite syenite pegmatites (Webmin, HOM). Minerals associated with nordite-(La) include sodalite, ussingite, murmanite, chkalovite, belovite, steenstrupine-(Ce), lomonosovite, eudialyte, microcline, nepheline, aegirine, sphalerite, neptunite and lamprophyllite (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 for nordite-(La), Pegmatite No. 65, Chinglusuai River Valley, Lovozersky District, Murmansk Oblast, Russia, nordite-(La) occurs in sodalite syenite associated with sodalite variety hackmanite, ussingite, neotocite variety chinglusuite and lomonosovite. Lamprophyllite, eudialyte, microcline, nepheline, aegirine, sphalerite and neptunite are subordinate minerals (AM 28.283).

At the type locality for nordite-(Ce), 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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