different between samarskite vs decipium

English

After Vasilii Evgrafovich Samarsky-Bykhovets in 1847.

samarskite (countable and uncountable, plural samarskites)

(mineralogy) A shiny black radioactive mineral that contains a complex mixture of rare earth oxides

decipium (uncountable)

(obsolete) Proposed name for a chemical element isolated from samarskite, later found to be a mixture of samarium and other rare earth elements.

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