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 Delta Flyer 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. (VOY: "One Small Step")

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