Amethyst
|
Refractive Index |
1.544 to 1.553 |
|
Birefringence |
0.009 |
|
Dispersion |
0.013 |
|
Specific Gravity |
2.65 |
|
Transparency |
Transparent to Translucent |
|
Pleochroism |
Weak |
|
Fluorescence |
Inert to weak greenish or bluish |
|
Optical Character |
Uniaxial - |
|
Cleavage |
None |
|
Fracture |
Conchoidal |
|
Lustre |
Vitreous |
|
Mohs Hardness |
7 |