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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
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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