FLUORITE

General Formula:
CaF2
System:
Isometric
TITLE
DESCRIPTION
SCALE
TITLE
DESCRIPTION SCALE
Block diagram showing the relationship between the crystallographic axes and the indicatrix axes.

Optical Properties

Colour
Pleochroism
usually colourless
non pleochroic
Form cubes or cubes modified by octahedral or dodecahedral faces, anhedral grains or granular masses
Relief
RI
moderate high negative
n = 1.433-1.435
Cleavage perfect octahedral celavage (4 directions)
Birefringence
Interference Colours
NA
NA
Twinning not usually visible
Interference Figure
Optic Sign
2V
isotropic - no interference figure Optic Orientation NA
Composition Sr, Y, or Ce for Ca Alteration none
Occurrence common in hydrothermal deposits and as an accessory in felsic igneous rocks Distinguishing Features high relief, octohedral cleavage, isotropic


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