General Information:
Chemical Formula:
Ca1-xYxF2+x, x~0.3
Composition:
(Molecular Weight = 98.42 gm)
Calcium 28.50 % Ca
Yttrium 27.10 % Y
Fluorine 44.40 % F
Empirical Formula:
Ca0.7Y0.3F2.3
Environment:
In pegmatites.
IMA Status:
Approved IMA 1987
Locality:
TL: Hoydalen, Telmark, Norway.
Name Origin:
Named for John Peder Tveit (1909-1978), Norwegian miner, who found it in his quarry.
Physical Properties:
Color:
white or light yellow.
Luminescence:
Fluorescent, Short UV=faint yellow orange.
Luster:
Greasy (Oily)
Streak:
white
More details...