Here is a brief description of technetium. Since its discovery, searches for the element technetium in terrestrial materials have been made without success.
Technetium is a silvery-grey metal that tarnishes slowly in moist air.
Until 1960, technetium was available only in small amounts. The chemistry of technetium is related to that of rhenium. Here is a brief summary of the isolation of technetium. It is never necessary to make a sample of techntium anywhere other than specialist laboratories. This is because technetium is radioactive.