Andalusite
Physical Properties
| Color | brown |
| Form/Habit | elongated square prismatic |
| Lusture | vitreous |
| Streak | white |
| Hardness | 7.5 |
| Cleavage | poor 2 sets rarely seen |
| Fracture | conchoidal |
| Specific Gravity | 3.8 (moderate) |
| Chemical Composition | Al2SiO5 |
| Crystal System | orthorhombic |
| Diagnostic Properties | elongated prismatic habit, rarely seen poor 2 sets cleavage |