| Mineral | Heulandite |
|---|---|
| Formula | (Ca,Na)2-3Al3(Al,Si)2Si13O36 • 12(H2O) |
| Crystal Form | Monoclinic/Unknown |
| Cleavage | [010] Perfect |
| Color | White, Reddish white, Grayish white, Brownish white, Yellow |
| Density | 2.2 g/cm3 |
| Diaphaneity | Transparent to subtranslucent |
| Fracture | Brittle |
| Hardness | 3.0 - 3.5 |
| Lustre | Vitreous - Pearly |
| Streak | White |
| Dana 8 Class | 77.1.4.1 |
| Strunz Class | VIII/J.23-10 |
| Mindat | mindat.org |
| WebMineral | WebMineral |
| ID | 55 |