What kind of drug looks like a crystal diamond?

What kind of drug looks like a clear like crystal diamond with a short pointed end? Pretty tiny. It looks too perfect of shape but I have found on two separate times on a bathroom counter and removed it. I am comcerned as this person I know has done cocaine, ice and other speeds. Please tell me exactly. I know nothing of drugs and want nothing to do with it if this is the case. What should I look for?|||CCCCRACK.....also look for brillo pads, and glass tubes....