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Mineralpedia Details for Bastnasite-(La)

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Bastnasite-(La)

Bastnasite-(La)

Named as a member of the bastnasite species which are in turn named for the original locality at the Bastnas mines in Vastmanland, Sweden and for the dominance of lanthanum over the other rare earth elements in the composition. Basnasite-La is a rare mineral that occurs in late ankerite carbonatites at its type locality in the Belaya Zima REE-Nb deposit in Russia. Additional localities include in Pakistan, Madagascar, Malawi, Nigeria, South Africa, South Korea, Australia, the United States, Germany, Greece, and Sweden.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/bastnasite-(La).pdf

Formula
LaCO3
Crystal System
Hexagonal 
Crystal Habit
Prismatic, Massive - Granular 
Cleavage
Imperfect, Indistinct, None 
Luster
Vitreous - Greasy 
Color
yellow, reddish brown 
Streak
white 
Class
Hexagonal - Ditrigonal Dipyramidal 
Fracture
Uneven 
Hardness
4-5 
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Bastnasite-(La) from Paratoo Cu mine, Mt Lofty Ranges, South Australia, Australia

Bastnasite-(La)
            from Paratoo Cu mine, Mt Lofty Ranges, South Australia, Australia

Crusts of minute blue globules on matrix with malachite.

Sky blue micro crytals as crusts on matrix.

Click thumbnail images for larger view.

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