Quartz
Optical Properties
In PPL
| Form | anhedral |
| Color | colorless |
| Pleochroism | absent |
| Relief | low |
| Cleavage | absent |
| Fracture | present |
| Twinkling | absent |
In XPL
| Iso/Aniso | Anisotropic |
| Interference Color | order-I grey |
| Extinction Angle | - |
| Twinning | absent |
| Form | anhedral |
| Color | colorless |
| Pleochroism | absent |
| Relief | low |
| Cleavage | absent |
| Fracture | present |
| Twinkling | absent |
| Iso/Aniso | Anisotropic |
| Interference Color | order-I grey |
| Extinction Angle | - |
| Twinning | absent |