Labradorite
Physical Properties
| Color | grey |
| form/Habit | crystalline massive |
| Lusture | vitreous |
| Streak | white |
| Hardness | 6 |
| Cleavage | 2 sets |
| Fracture | conchoidal |
| Specific Gravity | 2.70 (low) |
| Chemical Composition | (Ca, Na)(Al, Si)4O8 |
| Crystal System | triclinic |
| Diagnostic Properties | hardness of 6, 2 sets of cleavage, conchoidal fractures |