Horta

The Horta were a silicon-based lifeform indigenous to the planet Janus VI. First contact was made between the Horta and the United Federation of Planets in 2267. They became Federation members shortly thereafter. 

By the late 23rd century, several Horta served in Starfleet, including Lieutenant Naraht. In 2305, Sanaht began to represent his people on the Federation Council.