| Mineral | Nontronite |
|---|---|
| Formula | Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O |
| Crystal Form | Monoclinic/Prismatic [2/m] |
| Cleavage | Perfect {001} |
| Color | Green, olive-green, yellow-green, yellow, orange, brown |
| Density | 2.2 – 2.3 g/cm3 |
| Diaphaneity | Translucent, Opaque |
| Fracture | Splintery, Conchoidal |
| Hardness | 1.5 - 2.0 |
| Lustre | Resinous, Waxy, Dull |
| Streak | white |
| Type Loc. | Le Manderau, Saint-Pardoux-la-Rivière, Nontron, Dordogne, Nouvelle-Aquitaine, France |
| Dana 8 Class | 71.3.1a.3 |
| Strunz Class | 9.EC.40 |
| Mindat | mindat.org |
| WebMineral | WebMineral |
| ID | 500 |