Formula: (Ce,Ca)(Nb,Ti)2(O,OH)6
Multiple oxide, aeschynite group
Specific gravity: 5.04
Hardness: 5½
Streak: Brown
Colour: Black, dark red
Environments
Localities
At the type locality, the Vishnevye Mountains, Chelyabinsk Oblast, Russia, At the nioboaeschynite-(Ce)
occurs in quartz - arfvedsonite
veinlets cutting fenite associated with
quartz and
arfvedsonite
(HOM, Dana).
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