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JonseyCSGO t1_iz25avc wrote

Reply to comment by redruben234 in Why not use hydrogen and deuterium in fusion reaction rather than tritium and deuterium? by Curious_user4445

It's valuable largely because it's not the easiest thing to purify, as far as I understand it. As far as elements go, it's not uncommon in minerals, and it's not ultra rare in seawater, for easy reading: https://en.wikipedia.org/wiki/Lithium#Terrestrial

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