| Mineral | Neptunite |
|---|---|
| Formula | KNa2Li(Fe2+,Mn)2Ti2Si8O24 |
| Crystal Form | Monoclinic/Domatic [m] |
| Cleavage | [110] Good |
| Color | Black, Red |
| Density | 3.2 g/cm3 |
| Diaphaneity | Translucent |
| Fracture | Conchoidal |
| Hardness | 5.0 - 6.0 |
| Lustre | Vitreous |
| Streak | Brown |
| Type Loc. | Narssârssuk pegmatite, Narsaarsuk Plateau, Igaliku, Kujalleq, Greenland, Denmark |
| Dana 8 Class | 70.4.1.1 |
| Strunz Class | VIII/F.37-10 |
| Mindat | mindat.org |
| WebMineral | WebMineral |
| ID | 23 |