Niobium is a chemical element with the symbol Nb and it has an atomic number of 41. It has an atomic weight of 92.90638. ![](https://imgproxy.geocaching.com/7ae44e2610625b268bc3750d44e5610fc52f7dfe?url=http%3A%2F%2Ffarm6.static.flickr.com%2F5144%2F5769078046_c54d2f5069_o.jpg)
Things you might not know about Niobium:
- It is estimated that out of 44,500 metric tons of niobium mined in 2006, 90% was used in the production of high-grade structural steel, followed by its use in super alloys.
- Niobium and some niobium alloys are physiologically inert and thus hypoallergenic. For this reason, niobium is found in many medical devices such as pacemakers.
- Niobium is used as a precious metal in commemorative coins, often with silver or gold.
See GC2XAY2 - Hydrogen, for an explanation about this series of caches.
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