And the price is astronomical. As of November 28, the price for 99%+ purity rubidium carbonate was US$1205/kg, which equates to around US$1.205 million per metric tonne. Compare that to 99.2% pure ...

Rubidium is an alkali metal in group IA of the periodic table with atomic number 37, an atomic weight of 85.47, and a density of 1.53 Mg/m 3. Its melting point is 38.9 C, and it boils at 688 C. The ...