set of various gray unpolished minerals with names

andesite antimonite argillite background bismuthinite bornite coal collage collection cuprite cutout description diabase dolerite galena galenite gemstone geological glass granite graphite hematite iron isolated jaspilite jaspillite lodestone magnesite magnetite marble microgabbro mineral mineralogical name natural obsidian ore pisolite raw rock rough set slate sphalerite stibnite stone unpolished various volcanic white wolframite