Metallic lifeform

A metallic lifeform was a classification of microorganisms that had a cellular structure composed of metals. 
These lifeforms were purely speculative to the Federation until 2376, when an away team on the found fossilized metallic microbes in a rock inside a graviton ellipse. The rock was billions of years older than the Earth and estimated to originate from the time of the formation of the Milky Way Galaxy. ()
de: Metallische Lebensform
Category:Lifeform classifications