Neptunite
Chemical formula: KNa<sub>2</sub>LiFe<sup>2+</sup><sub>2</sub>Ti<sup>4+</sup><sub>2</sub>Si<sub>8</sub>O<sub>24</sub>
Properties
- Mohs hardness
- 5-6
- Color
- Black to dark red
- Streak
- Cinnamon-brown
- Density
- 3.19
- Cleavage
- on {110}
- Fracture
- Conchoidal
- Transparency
- Opaque
- Crystal system
- Monoclinic