General Information:
Chemical Formula:
Ca3Al2F10(OH)2·(H2O)
Composition:
(Molecular Weight = 416.21 gm)
Calcium 28.89 % Ca
Aluminum 12.97 % Al
Hydrogen 0.97 % H
Oxygen 11.53 % O
Fluorine 45.65 % F
Empirical Formula:
Ca3Al2F10(OH)2·(H2O)
Environment:
In banded fluorite-sellaite-tournaline ores.
Locality:
Yaroslav, Siberia, Russia.
Name Origin:
Named for the locality.
Physical Properties:
Cleavage:
[???] Good, [???] Good
Color:
white.
Density:
3.09
Diaphaniety:
Transparent
Habits:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Fibrous - Crystals made up of fibers., Spherical - Spherical, rounded aggregates.
Hardness:
4.5 - Between Fluorite and Apatite
Luminescence:
Weakly Fluorescent, Short UV=pale violet.
Luster:
Vitreous (Glassy)
Streak:
white
More details...