Columbite stone is found in "South Africa" / "Germany" / "Italy" / "France" / "Sweden" and "Greece",
It is characterized by the following chemical and physical properties:
Physical properties
- The form is prismatic / short
- The group oxides
- The scratch is dark red to black
- Hardness 6.5 / 6
- The color is iron black / brown black
- Translucent / Opaque
- Metallic sparkle
Chemical properties
- Density 5.2 / 6.8
- A particular crystal system exists
- The chemical formula is manganese oxide and tantalum