I was digging through my cabochons and found some that I had purchased back in my stained glass days. I have no idea what the bottom cab is. It kind of looks like sandstone, but has a pretty pink layer in it... is that natural? No idea. I do know that it is some sort of rock though, so I'm OK naming this necklace "Rock Goddes". The "head" cab is probably quartz. Apparently I need to keep better records of my purchases! I'm thinking of beading a series of Rock Goddesses... lets see how that goes!