Calm Chakra Raw Pyrite Crystal (2 sizes) - Seek The Uniq
Californium-252 (Cf-252) Neutron Sources
Precious Metals - World's Top 10
WebElements Periodic Table » Carbon » the essentials
WebElements Periodic Table » Gold » uses
What Is the Most Expensive Element?
At $57 million, this is now the world's most expensive diamond. At 2.9 grams, gram per gram, the only thing more expensive is Californium 252 and Antimatter. : r/VeryExpensive
The 15 Most Expensive Materials in the World | TheRichest