Rhenium is one of the rarest elements in Earth's c
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Posted On: 08/07/2020 7:30:21 AM
Rhenium is one of the rarest elements in Earth's crust with an average concentration of 1 ppb; other sources quote the number of 0.5 ppb making it the 77th most abundant element in Earth's crust.
https://www.miningnewsnorth.com/story/2018/11.../5472.html
https://www.miningnewsnorth.com/story/2018/11.../5472.html
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