I read this book when I was a teenager (late 70's early 80's) and cannot remember its name or author.
An alien race is discovered, their planet is metal poor so their technology is glass based, they also surgically implant an organ that gives them telepathic ability.
Ring any bells to anyone, what was it called?
Edit
Just remembered something about it, the initial Alien that is encountered is adrift in space in some kind of stasis pod, has been for a long time (many years)