Archive for the Apatite Group Category
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Refractive Index : 2.416 – 2.350
Optical Characteristic : DR, Uniaxial negative
Specific Gravity : 7.10 – 6.80
Formula : Pb5(VO4)3CI
Crystal System : Hexagonal
Variety/Species : Vanadinite
Species/Group : Apatite Group
Birefringence : 0.066
Dispersion : 0.202
Hardness : 3.5 to 4
Toughness : Poor
Ultrasonic : Never
Steam : Never
UV Long : Inert
UV Short : Inert
Pleochroism : 2 colors
Strength : weak
Pleochroism Colors : Very weak [...]
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Refractive Index : 1.650 – 1.636
Optical Characteristic : DR, Uniaxial negative
Specific Gravity : 3.23 – 3.12
Formula : Ca5(PO4)3F
Crystal System : Hexagonal
Variety/Species : Wilkeite
Species/Group : Apatite Group
Birefringence : 0.010
Dispersion : 0.13
Hardness : 5
Toughness : Poor
Ultrasonic : Never
Steam : Never
UV Long : Inert
UV Short : Inert
Pleochroism : None
Strength : N/A
Pleochroism Colors : None
Heat : Sensitive
Acids : Sensitive
Light [...]