| Mineral | Astrophyllite |
|---|---|
| Formula | (K,Na)3(Fe,Mn)7Ti2Si8O24(O,OH)7 |
| Crystal Form | Triclinic/Pinacoidal [1] |
| Cleavage | Perfect on {001}, Poor on {100} |
| Color | Bronze-yellow, Golden yellow, Brown to Reddish brown. |
| Density | 3.2 – 3.4 g/cm3 |
| Diaphaneity | Translucent, Opaque |
| Fracture | Irregular/Uneven |
| Hardness | 3.0 |
| Lustre | Greasy, Pearly, Sub-metallic |
| Streak | Golden yellow |
| Type Loc. | Låven, Langesundsfjorden, Larvik, Vestfold, Norway |
| Dana 8 Class | 69.1.1.1 |
| Strunz Class | 8/G.12-40 |
| Mindat | mindat.org |
| WebMineral | WebMineral |
| ID | 337 |