Facts
- Country
- United States
- Minerals
- 1
- First described here
- Columbite-(Fe)
Sources: Wikidata (CC0), IMA list of minerals via Wikidata · Wikidata Q2723791
Minerals first described here · 1
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Columbite-(Fe) | Fe²⁺Nb₂O₆ | Orthorhombic | — | — |