I'm not sure what living rocks you may have seen on the totally fictional series Star Trek, but modern scientists might actually be led to consider such things because of actual scientific evidence. They are NOT being "unoriginal" and somehow stealing a wacky idea from science fiction. To believe otherwise is like believing Wilbur and Orville Wright were "unoriginal" and stole the idea of flight from Icarius.
Haven’t paid attention to ST for years and years. I renounce it as a vehicle of evolutionary propaganda (and other “progressive” ideology). I do remember it’s episode about silicon based life, though. It was called “The Devil in The Dark”.
http://www.daviddarling.info/encyclopedia/S/siliconlife.html
https://en.wikipedia.org/wiki/The_Devil_in_the_Dark