其定义
The niobium mineral of carbonatite deposits, and the reason niobium supply is so geographically concentrated.
来源于此的材料
| 材料 | 角色 | 品位说明 |
|---|---|---|
| Niobium | Principal ore | — |
矿石矿物
Pyrochlore
The niobium mineral of carbonatite deposits, and the reason niobium supply is so geographically concentrated.
Estonian Museum of Natural History Specimen No 202616 photo… ·
Mai Seppel ·
CC BY-SA 4.0
· Wikimedia Commons
