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Formula: PbLa(CO3)2(OH).H2O
Carbonate, ancylite group,
lanthanum-bearing mineral
Crystal System: Orthorhombic
Specific gravity: 5.007 calculated
Hardness: 3½ to 4
Streak: White
Colour: Colourless, pale yellow
Environments
Gysinite-(La) is a new mineral, approved in 2022 and to date (April 2023) reported only from the type locality.
Localities
At the type locality, the Saima complex, Kuandian County, Dandong, Liaoning, China, gysinite-(La) has been discovered in
lujavrite. It commonly occurs as subhedral to anhedral, granular and platy
crystals of 5 to 50 μm in size, in interstices or enclosed in microcline,
aegirine and nepheline. Associated minerals
include nepheline, aegirine,
microcline, natrolite,
eudialyte, lamprophyllite,
bastnäsite-(Ce), parisite-(Ce),
ancylite-(La), ancylite-(Ce),
bobtraillite, britholite-(Ce),
thorite, calcite and
galena. Gysinite-(La) crystals are generally transparent, colourless, or pale
yellow, with a vitreous lustre and white streak
(MM 87.1.143-150).
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