set of various polished brown stones with names

agate background bauxite belemnoid brown bulleye collage collection cut cutout description eudialyte galenite gem gemstone glass heliolite hydrogoethite hypersthene isolated jasper jaspilite jaspillite mineral name natural nunderite obsidian out oxeye polished pumice quartz rock sample set smokyquartz specimen sphalerite sphene stone sunstone syenite thunderbolt thunderstone tigereye titanite tumbled tumbling turritella various volcanic white