"I've heard of the theoretical possibility of life based on silicon, but silicon-based life would be of an entirely different order."
– James T. Kirk, 2267 ("The Devil in the Dark")

A silicon-based lifeform was a corporeal lifeform that used silicon as the basis of its structure and life functions rather than carbon. Silicon-based lifeforms generally did not evolve on M-class planets. (ENT: "Observer Effect")

In 2151, Captain Jonathan Archer of Enterprise NX-01 tried to convince Commander Charles Tucker III that Starfleet had sent them on a top secret classified mission to a planet to make first contact with a silicon-based lifeform, when Tucker was hallucinating "people coming out of the rock face." Archer told Tucker it was a major breach of security to reveal that information, because T'Pol was the only person granted clearance to speak with them, since they had supposedly made contact with the Vulcans before. (ENT: "Strange New World")

Silicon-based life was thought to be physiologically impossible before the discovery of the Horta of Janus VI in 2267. It was not possible for silicon life to evolve in an oxygen atmosphere. (TOS: "The Devil in the Dark")

In 2269, the USS Enterprise encountered Yarnek, a representative of the Excalbians, a shapeshifting silicon-based species native to the planet Excalbia, described as being "almost mineral" and "like living rock with heavy fore-claws." (TOS: "The Savage Curtain")

In 2336, the Omicron Theta colony was destroyed by the Crystalline Entity. (TNG: "Datalore", "Silicon Avatar")

In 2364, the USS Enterprise-D discovered the microbrain, an inorganic lifeform found during terraforming of the planet Velara III. (TNG: "Home Soil")

In 2374, a Hirogen hunter boasted to Tom Paris about tracking a silicon-based lifeform through the neutronium mantle of a collapsed star. (VOY: "Prey")

Martian insects in the Spaceflight Chronology were described as being silicon-based lifeforms.

Silicon-based lifeformsEdit

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