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. 
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.
Fgrc npebff gur ybj oneo jver naq vg vf gvrq gb n cbfg ba gur arj srapr.