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The silicon creatures of Centuri were silicon-based lifeforms native to the planet Centuri.
The silicon creatures of Centuri were among the many strange forms life took throughout the star-spackled cosmos, the list of which also included the gaseous beings of Madras IV, the furry, insatiable tribbles, the mental giants of Taos, and the betasaur. (TOS comic: "The Enterprise Mutiny")