General Information:
Chemical Formula:
Ca(Ce,La)2(CO3)3F2
Composition:
(Molecular Weight = 537.24 gm)
Calcium 7.46 % Ca
Lanthanum 23.27 % La
Cerium 28.69 % Ce
Carbon 6.71 % C
Oxygen 26.80 % O
Fluorine 7.07 % F
Empirical Formula:
CaCe1.1La0.9(CO3)3F2
Environment:
In calcite veins in hydrothermal deposits.
IMA Status:
Approved IMA 1987
Locality:
Emerald mines, Muso, columbia.
Name Origin:
Named for J. J. Paris, mine proprietor at Muzo, north of Bogota, Columbia.
Physical Properties:
Cleavage:
[0001] Distinct
Color:
brown, brownish yellow, grayish yellow, or yellow.
Density:
4.36
Diaphaniety:
Transparent to translucent
Habits:
Acicular - Occurs as needle-like crystals., Striated - Parallel lines on crystal surface or cleavage face., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
4.5 - Between Fluorite and Apatite
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Greasy
Streak:
white
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