Nepheline
Physical Properties
| Color | white |
| Form/Habit | massive |
| Lusture | greasy |
| Streak | white |
| Hardness | 5.5-6 |
| Cleavage | poor |
| Fracture | sub conchoidal |
| Specific Gravity | 2.60 (low) |
| Chemical Composition | (Na, K)AlSiO4 |
| Crystal System | hexagonal |
| Diagnostic Properties | poor cleavage, subconchoidal cleavage |