CaF2
Isometric
DESCRIPTION
SCALE
DESCRIPTION SCALE
| General Formula: CaF2 |
System: Isometric |
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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 |
