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Formula: (Ce,Ca,Sr)CO3(OH,H2O)
Hydrated carbonate containing hydroxyl, ancylite group,
cerium- and strontium-
bearing mineral
Crystal System: Orthorhombic
Specific gravity: 4.30
Hardness: 4 to 4½
Colour: Pink in daylight, blue-grey in fluorescent light (Dana)
Solubility: Readily soluble in acids
Environments:
Plutonic igneous environments
Pegmatites
Hydrothermal environments
Calcioancylite-(Ce) is a rare secondary rare-earth
mineral that occurs with carbonates and alkali igneous rocks such as
syenitic
pegmatites
(Dana).
Localities
At Mont Saint-Hilaire, Quebec, Canada, calcioancylite-(Ce) occurs in alkaline igneous rocks (HOM).
At Tvedalen, Larvik, Vestfold og Telemark, Norway, calcioancylite-(Ce) was found as a brown, pulverulent
(powdery or crumbly) material occurring as a decomposition product from an unidentified calcium -
rare earth element in a
syenite
pegmatite at the Tuften
larvikite quarry. A second occurrence was in a
syenite
pegmatite in the Treschow
larvikite quarry, where the calcioancylite-(Ce) occurs as
well developed, pale rose-coloured crystals up to 2 mm across, in vugs associated with
epididymite, chiavennite,
gadolinite-(Ce), chlorite
and zeolites
(JWW p157).
In New york city, New York, USA, calcioancylite-(Ce) was discovered with
ancylite-(Ce)
as crystals on stilbite in rock that was dumped from the excavation of
the 63rd
Street subway tunnel (R&M 84-3.225).
At its type locality Foote mine, Cleveland county, North Carolina, USA, calcioancylite-(Ce) occurs in
lithium pegmatites
associated with monazite-(Ce) (Dana).
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