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Formula: (CaLa5)(Fe3+Al3Fe2+)[Si2O7][SiO4]5O(OH)3
Sorosilicate (Si2O7 groups),
radekškodaite group,
lanthanum-bearing mineral
Crystal System: Monoclinic
Specific gravity: 4.684 calculated
Hardness: 6
Colour: Light brown
Luminescence: Not fluorescent under UV
Environments
Zilbermintsite-(La) is a new mineral, approved in 2023 and to date reported only from the type locality.
Localities
At the type locality, Mochalin Log, Kyshtym, Chelyabinsk Oblast, Russia, zilbermintsite-(La) was found in a
single polymineralic nodule; it forms anhedral grains up to 0.65 × 0.20 mm at the contact of
ferriperbøeite-(La),
törnebohmite-(La) and
ferriallanite-(Ce). Other associated minerals include
bastnäsite-(La), biraite-(La),
ferriallanite-(La),
ferriperbøeite-(Ce),
fluorbritholite-(Ce),
monazite-(La),
perbøeite-(La),
percleveite-(Ce),
percleveite-(La),
perrierite-(Ce),
perrierite-(La), thorianite,
thorite and quartz.
Zilbermintsite-(La) is light brown, translucent in thin fragments and with a vitreous lustre.
(MM 88.3.302–311).
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