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Formula: (LaCa)(CO3)2(OH)(H2O)
Hydrated carbonate containing hydroxyl, ancylite group
Crystal System: Orthorhombic
Specific gravity: 4.324 calculated
Hardness: 4
Streak: White
Colour: Colourless to pale pinkish grey
Luminescence:
Solubility:
Common impurities:
Environments:
Plutonic igneous environments
Pegmatites
Calcioancylite-(La) is a new mineral, approved in 2021.
Localities
At the type locality, the Gejiu intrusion, Gejiu City, Honghe, Yunnan, China, calcioancylite-(La) has been
discovered from nepheline syenite as aggregates of subhedral
grains, from 5 to 20 μm in size. It is colourless to pale pinkish grey, and transparent to translucent
(MM 87.554-560).
Associated minerals include calcioancylite-(Ce),
ancylite-(La),
ancylite-(Ce),
britholite-(Ce),
fluorcalciobritholite,
moxuanxueite, bobtraillite,
catapleiite, baddeleyite,
jadeite, zircon,
magnetite, andradite,
orthoclase and albite
(Mindat).
At the Stetind pegmatite, Narvik, Nordland, Norway, calcioancylite-(La) is found in dissolution cavities
associated with xenotime-(Y),
calcioancylite-(Nd) and
atelisite-(Y)
(EJM 24.6.1053–1060).
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