General Information:
Chemical Formula:Ca3Al2F10(OH)2·(H2O)
Composition:(Molecular Weight = 416.21 gm)Calcium 28.89 %
CaAluminum 12.97 %
AlHydrogen 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
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