What is "staurolites"

Usage examples of "staurolites".

So I asked him what did he want, and he points to all the staurolites I got in the pan to left of the register, you know, and he asked me what were those.

I got a whole bunch more in a cardboard box in back that Onofre Martinez sold me, so I said sure, go ahead, and after counting them the freak hands me thirty-eight dollars and just scoops all those staurolites off the tray, stuffs them into his pockets, and makes the sign of the cross or something .