| Mineral | Arfvedsonite |
|---|---|
| Formula | NaNa2Fe2+4Fe3+(Si8O22)(OH)2 |
| Crystal Form | Monoclinic/Prismatic [2/m] |
| Cleavage | Perfect on {110} |
| Color | Bluish-black, Black |
| Density | 3.3 – 3.5 g/cm3 |
| Diaphaneity | Translucent, Opaque |
| Fracture | Irregular/Uneven |
| Hardness | 5.0 - 6.0 |
| Lustre | Vitreous |
| Streak | Deep bluish-gray, Gray-green |
| Type Loc. | Kangerdluarssuq Firth, Ilimaussaq complex, Narsaq, Kitaa Prov., Greenland |
| Dana 8 Class | 66.01.03c.09 |
| Strunz Class | 8/F.08-100 |
| Mindat | mindat.org |
| WebMineral | WebMineral |
| ID | 288 |