Hydroxylbastnäsite-(La)

hydroxylbastnasite-(La)

ferriperboeite-(Ce)

percleveite-(La)

tornebohmite-(La)

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Formula: La(CO3)(OH)
Carbonate, bastnasite group, lanthanum-bearing mineral, paramorph of kozoite-(La)
Crystal System: Hexagonal
Specific gravity: 4.75 measured, 4.778 calculated
Hardness: 4
Streak: White
Colour: Light brown, light honey-yellow, colourless
Common impurities: Nd, Ce
Environments

Plutonic igneous environments

Localities

In the Nikšic Municipality, Montenegro, both hydroxylbastnäsite-(Nd) and hydroxylbastnäsite-(La) occur (JWW pps 268-270)

There are two co-type localities, Mochalin Log, Kyshtym, Chelyabinsk Oblast, Russia and the Vuoriyarvi alkaline-ultrabasic massif, Northern Karelia, Murmansk Oblast, Russia. Final approval is based on material from the Vuoriyarvi complex (Mindat).

At the Vuoriyarvi alkaline-ultrabasic massif, Northern Karelia, Murmansk Oblast, Russia, hydroxylbastnäsite-(La) occurs as clusters (up to 1 mm) of light brown, honey-yellow or colourless hexagonal tabular to short-prismatic crystals up to 0.15 mm, and light brown grains up to 0.2 mm included in massive aggregates of other light rare earth element minerals. Associated minerals include allanite-(Ce), ancylite-(Ce), bastnäsite-(Ce), bastnäsite-(La), biraite-(Ce), biraite-(La), ferriperbøeite-(Ce), fluorite, percleveite-(Ce), percleveite-(La) and törnebohmite-(La) (Mindat).

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