a couple of shiny muscovite mica mineral crystals on black. found in volodar volynsky, ukraine. for geology mineralogy

article background black brilliant catalogue classbook closeup collection crystal dark decoration design detail education encyclopedia euhedral fossil gem gemstone geological geology glossy isinglass isolated jewel magazine material mica mine mineral mineralogy muscovite museum natural nature poster potash rock schoolbook science semiprecious shape shiny stone structure surface textbook texture ukraine volodar volynsky