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So why is #fluorite so interesting?
The reason is yttrium. Yttrium is an "honorary" rare earth element. It's often grouped with them, and mined from the same minerals. pic.twitter.com/CrzV7NmKOu

— Michael Anenburg (@manenbu) September 26, 2020

via Twitter https://twitter.com/manenbu

September 26, 2020 at 04:57PM