Alexkuznetsovite-(La)

alexkuznetsovite-(La)

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Formula: La₂Mn(CO₃)(Si₂O₇)
Sorosilicate (Si₂O₇ groups), biraite group, lanthanum- and manganese- bearing mineral
Crystal System: Monoclinic
Specific gravity: 4.713 calculated
Hardness: 5
Streak: White
Colour: Brown to dark brown
Environments

Placer deposits

Alexkuznetsovite-(La) is a relatively new mineral, approved in 2019 and to date (September 2023) reported only from the type locality.



Localities

At the type locality, Mochalin Log, Kyshtym, Chelyabinsk Oblast, Russia, alexkuznetsovite-(La) occurs as anhedral grains, up to 0.4 mm in diameter, in polymineralic nodules from the rare-earth-element deposit. Associated minerals include törnebohmite-(La), törnebohmite-(Ce), percleveite-(La), percleveite-(Ce), perbøeite-(La), perbøeite-(Ce), fluorbritholite-(Ce), bastnäsite-(La), bastnäsite-(Ce), allanite-(La) and allanite-(Ce) (Mindat).

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