In describing a certain sleeping stone goddess in a recent game, I alluded to the walls of Greenstone temple. Then I had one of my players ask, innocently, "Is it what we would call jade?"
Frankly, I was stumped for a moment. I didn't think so. In my mind, I had always imagined "greenstone" as some kind of limestone-like rock with webs of green in it (perhaps oxidized copper). I, however, know diddly about rocks (or have forgotten pretty much everything I learned in college-level geology).
Could someone please elucidate?