Thank you for your quick and informative answer. I didn't think it was good, but I had no idea it was so dangerous. I have been designing jewelry for 20 years out of anything and everything imaginable, but my first love has been the simplicity of the stone, regardless of its value. I am glad to have found this group, to help me in the future, possibly stop from damaging my health or someone else's through my ignorance.
This box is probably 10 yrs old, untouched, until I did some housekeeping recently. The stones that are "clear", without any visible sign of disease, are they sealed or safe perhaps. I love the organic look of pyrite and didn't remember even owning any. I hate the thought of chunking good stones.