In the polished and the rough (solid) form it is safe to handle. when grinding and polishing you do want to wear a respirator.
If the rough is real crumbly, it wouldn't hurt to wash your hands after handling it. this holds true for any of the copper based minerals (malachite, azurite, chryscolla, etc...).
By the prickling of my thumbs,
something Wiccan this way comes!