Parisite

minerals

bastnasite

synchysite

cordylite

Formula:
Parisite-(Ce): CaCe2(CO3)3F2
Parisite-(La): CaLa2(CO3)3F2
Both are anhydrous carbonates containing halogen
Data for parisite-(Ce)
Specific gravity: 4.33 to 4.39
Hardness: 4½
Streak: Light yellow
Colour: Brown to yellow; colourless to yellow in transmitted light
Solubility: Soluble in hot strong acids
Common impurities: Y,Sr
Weakly RADIOACTIVE
Environments:

Pegmatites
Carbonatites
Hydrothermal environments

Parisite-(Ce) is found in calcite veins in hydrothermal deposits, in granite pegmatites and in carbonatites rich in rare-earth elements. Associated minerals include bastnäsite, synchysite, cordylite, ancylite, calcite, fluorite, riebeckite, zircon and quartz (HOM, Mindat).

Localities

There are two co-type localities, both at the Muzo Municipality, Boyacá Department, Colombia. The parisite-(Ce) occurs in intensely folded, carbonaceous shale beds, associated with pyrite, marcasite, cerium-bearing dolomite, albite, calcite, quartz, gypsum and beryl variety emerald (Dana, Mindat).

At the Trimouns Talc Mine, Luzenac, Foix, Ariège, Occitanie, France, parisite-(Ce) crystals to 2.8 cm long occur in crystalline dolomite interbedded with dark green to black shale (Minrec 35.3.240-241).

At Itorendrika-Ifasina, Imorona valley, Itremo, Ambatofinandrahana, Amoron'i Mania, Madagascar, parisite-(Ce) occurs with bastnäsite and chevkinite (Dana ).

At the Zagi Mountain, Hameed Abad Kafoor Dheri, Peshawar District, Khyber Pakhtunkhwa Province, Pakistan, parisite-(Ce) occurs as crystals to 3 cm and also as epitaxial overgrowths on bastnäsite (Minrec 35.3.217-218)

At the Fallon Brothers Quarry, Quincy, Norfolk county, Massachusetts, USA, parisite-(Ce) occurs in pegmatite pipes in granite, associated with aegirine, microcline, riebeckite, fluorite, ilmenite and anatase (Dana ).

At Pyrites, Ravalli county, Montana, USA, parisite-(Ce) occurs with pyrite in altered trachyte (Dana ).

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