Martin Heinrich Klaproth, isolating a black powder…

Martin Heinrich Klaproth, isolating a black powder from pitchblende in 1789, concludes that it contains an undiscovered element, which he names it uranium after the recently discovered planet Uranus.

The German chemist has in fact discovered the oxide.

Also in 1789 he identifies the element zirconium from its oxide during his investigation of the gemstone now called zircon and named for the Arabic word for the stone, zargun (gold color),