Orthoclase
Optical Properties
In PPL
| Form | subhedral |
| Color | colorless |
| Pleochroism | absent |
| Relief | low |
| Cleavage | 2 sets |
| Fracture | - |
| Twinkling | absent |
In XPL
| Iso/Aniso | anisotropic |
| Interference Color | order-I grey-white |
| Extinction Angle | 12 degrees inclined |
| Twinning | absent |