Gemological Properties of Corundum
|
S.No |
Description |
Physical properties / Optical properties |
|
1 |
Chemical formula |
Al2O3 |
|
2 |
Group |
Corundum |
|
3 |
Crystal system |
Trigonal / Hexagonal |
|
4 |
Color |
Colorless , Red, blue, green, orange, pink, yellow |
|
5 |
Specific gravity |
3.95 to 4 |
|
6 |
Hardness |
9 |
|
7 |
Durability |
Excellent |
|
8 |
R.I |
1.762 to 1.770 |
|
9 |
Fluoresce |
Varies |
|
10 |
Optical sign |
Uniaxial Negative |
|
11 |
Inclusions |
Mostly, liquid inclusions, Needles, solid inclusions |
No comments:
Post a Comment