Gemological
Properties of Apatite
|
S.No |
Description |
Physical
properties / Optical properties |
|
1 |
Chemical formula |
Ca5[PO4]3(OH,F,Cl) |
|
2 |
Group |
Apatite Group |
|
3 |
Crystal system |
Hexagonal |
|
4 |
Color |
Colorless,
blue, green, brown |
|
5 |
Specific gravity |
3.13
to 3.26 |
|
6 |
Hardness |
5 |
|
7 |
Durability |
Poor |
|
8 |
R.I |
1.635
to 1.645 |
|
9 |
Fluoresce |
Mostly |
|
10 |
Optical sign |
Uniaxial
Negative |
|
11 |
Inclusions |
Mostly
Needles |
 |
| Fluorescent Apatite Raman Spectra |
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