Ferronordite

ferronordite

ussingite

steenstrupine-(Ce)

epistolite

Images

Formulae:
ferronordite-(Ce): Na₃SrCeFe²⁺Si₆O₁₇
ferronordite-(La): Na₃SrLaFe²⁺Si₆O₁₇
Inosilicates (chain silicates), nordite group
Crystal System: Orthorhombic
Specific gravity: ferronordite-(Ce): 3.46 measured; ferronordite-(La): 3.54 measured, 3.62 calculated
Hardness: 5 to 5½
Streak: White
Colour: Colourless, Light coffee brown.
Weakly RADIOACTIVE
Environments

Pegmatites

Ferronordite-(Ce) occurs in areas of ultra-alkaline mineralisation in small cavities in pegmatoid sodalite syenites, and in ussingite veinlets. Ferronordite-(La) occurs in hyperagpaitic pegmatites (hyperagpaitic rocks are nepheline syenites with a high ratio of sodium and potassium to aluminium in which minerals such as ussingite and naujakasite crystallise instead of, or in addition to, feldspars and feldspathoids) (Webmin).

Localities

Ferronordite-(Ce) has two co-type localities, the Chinglusuai River Valley, and the Karnasurt Mountain, both in the Lovozersky District, Murmansk Oblast, Russia

The type locality for ferronordite-(La) is the Bolshoi Punkaruaiv Mountain, Lovozersky District, Murmansk Oblast, Russia, where it occurs in ussingite cores of two hyperagpaitic pegmatites (hyperagpaitic rocks are nepheline syenites with a high ratio of sodium and potassium to aluminium in which minerals such as ussingite and naujakasite crystallise instead of, or in addition to, feldspars and feldspathoids). Associated minerals include aegirine, epistolite, sphalerite, steenstrupine-(Ce) and serandite (Mindat).

Ferronordite from the Bolshoi Punkaruaiv Mountain - Image

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