three stones similar except in color . . .

and I have no idea what they could be. I need to talk to the rock shop and have them tell me, for now though this is what they look like:

the colors (which could be dye) are yellow, blue, and sea-green. There are specks of black and reflective crystal showing and have been polished. For some reason Chalcodyte comes to mind, but that may not even be a word. any ideas?

Sorry paradoxx- I am just now seeing this thread.

With out a picture it is hard to say for sure, but it is possiple it is in the Pyrite family.

I can share with you Justins link for chalcopyrite.

do any of those look like the one you have? or are they more of a crystal than a stone?