After adding (quite conspicious) thallium to the database my imagination made me wondering if it ever be a day when all the stable elements will have native occurrences on Earth, or we have to wait for native sodium from Luna (right, Pavel? :-))). And this makes me a little sad that elements like astatine are just too unstable to form any minerals. But maybe someone have heard any rumors on, e.g., Dy or Tb concentration high enough for own species?
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