Törnebohmite-(La)

tornebohmite-(La)

cerite

bastnasite

allanite

Images

Formula: La₂Al(SiO₄)₂(OH)
Nesosilicate (insular SiO₄ groups), lanthanum-bearing mineral
Crystal System: Monoclinic
Specific gravity: 4.805 measured
Hardness: 4½
Colour: Green, olive-green
Environments

Pegmatites

Localities

At the type locality, Mochalin Log, Kyshtym, Chelyabinsk Oblast, Russia, törnebohmite-(La) replaces cerite-(CeCa), in turn replacing bastnäsite, in a granite pegmatite in the fenitisation zone of the nepheline syenite massif. Associated minerals include cerite-(CeCa), bastnäsite, allanite and feldspar (HOM).
Tornebohmite-(La) from Mochalin Log - Image

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