| Mineral | Cronstedtite |
|---|---|
| Formula | Fe2+2Fe3+((Si,Fe3+)2O5)(OH)4 |
| Crystal Form | Trigonal/Ditrigonal Pyramidal [3m] |
| Cleavage | Perfect on {001} |
| Color | Black, Dark brown-black, Green-black |
| Density | 3.3 – 3.4 g/cm3 |
| Diaphaneity | Translucent |
| Hardness | 3.5 |
| Lustre | Sub-metallic |
| Streak | Dark olive green |
| Type Loc. | Příbram, Central Bohemia Rgn., Bohemia, Czech Republic |
| Dana 8 Class | 71.1.4.7 |
| Strunz Class | 8/H.27-120 |
| Mindat | mindat.org |
| WebMineral | WebMineral |
| ID | 321 |