set of various tumbled brown stones with names

background bronzite brown bulls calcite chondrodite collage collection cut cutout description eye galenite garnet gem gemstone glass heliolite isolated jasper mahogany marl marlstone microcline mineral name natrolite natural obsidian out oxs polished pumice pyrope quartz rock rutilated sample set shale smoky sphalerite sphene spreustein stone sunstone tigers tinaksite titanite tumbled tumbling various volcanic white