Nordite-(La)

nordite-(La)

belovite

neptunite

lomonosovite

Formula: Na₃SrLaZnSi₆O₁₇
Phyllosilicates (sheet silicates), nordite group
Crystal System: Orthorhombic
Specific gravity: 3.43 to 3.48 measured, 3.41 calculated
Hardness: 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 the type locality, 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).

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