Bastnäsite-(La)

bastnasite-(La)

bastnasite

fluorcerite

cerianite-(Ce)

Images

Formula: La(CO₃)F
Anhydrous carbonates containing halogen, bastnäsite group, lanthanum-bearing mineral
Crystal System: Hexagonal
Specific gravity: 4.89 calculated
Hardness: 4 to 5
Streak: White
Colour: Yellow, reddish brown
Weakly RADIOACTIVE
Environments:

Pegmatites
Carbonatites

Localities

At the Marmara bauxite deposit, Megara, West Attica, Attica, Greece, bastnäsite-(La) was discovered together with bastnäsite-(Ce) (JWW p268)

At Odegi, Nasarawa, Nigeria, is associated with fluocerite and cerianite-(Ce) (HOM).

At the type locality, the Belaya Zima REE-Nb deposit, Tuva, Russia, bastnäsite-(La) occurs in late ankerite carbonatite (HOM).

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