This substance is always native-it is always in the metallic state; and the metals with which it is found connected, and which are rarely found elsewhere, are palladium, rhodium, iridium, osmium, and ruthenium.
"The Chemical History Of A Candle"
Michael Faraday
So with iridium and rhodium, and osmium and ruthenium, which are so closely allied that they make pairs, being separated each from its own group.
"The Chemical History Of A Candle"
Michael Faraday
He now turned to the use of almost infusible metals-such as boron, ruthenium, chromium, etc.
"Edison, His Life and Inventions"
Frank Lewis Dyer and Thomas Commerford Martin