Rhodium APEX Mineral

Rhodium (Rh #45) is the next element on the periodic table for my APEX mineral collection.   

Wikipedia Rhodium

Rhodium Minerals - There are extremely few Rhodium minerals.  I gave up trying to get my APEX mineral for Rhodium.

Rhodium is one of the rarest and most valuable precious metals (2 to 6 times the price of gold).  Most Rhodium exists as free metal (it is nearly inert with other elements)  alloyed with other platinoid metals (Iridium, Osmium, Platinum).  World production is only 30 tons per year.

Rhodium is one of the six Platinum Group Metals.  These are precious metals which have similar physical and chemical properties, and tend to occur together in the same mineral deposits.

Rhodium was unknown until modern times.

Rhodium is primarily used in automobile catalytic converters.

Rhodium plays no natural biological role.