Your photos are fine, the material is very pretty. Not to be insulting, this is they type of material I toss in my load when everything else that has visible or assayable/scannable values is already loaded. I'm saving some of the prettiest pieces to sell as samples, milling and smelting the rest. If you flake off some of the chalcopyrite, you can do a malleability test with a hammer and a flat steel surface. Gold with a high level of purity will cleanly flatten, the edges won't crack. It also has high ductility- you can draw it out into a very fine wire, if pure, about one ounce per mile. Silver is also malleable, just not as much as gold, and ductile but less so. Lesser % purity gold will flatten, but the edges will crack, especially if it contains lead, tin, copper. Pyrites will just shatter. Exposure to intense sunlight will make pyrites turn brownish due to surface oxidation. The stench of smelting pyrite is also pretty offensive, neighbors may complain.