Parisite

Formula:
Parisite-(Ce): CaCe2(CO3)3F2
Parisite-(La): CaLa2(CO3)3F2
Both are anhydrous carbonates containing halogen
Specific gravity: 4.33 to 4.39
Hardness:
Streak: Light yellow
Colour: Brown to yellow; colourless to yellow in transmitted light
Solubility: Soluble in hot strong acids
Environments:

Hydrothermal environments

Parisite is found in calcite veins in hydrothermal deposits