onyx is banded variety of chalcedony with chemical composition sio2

background banded beautiful beauty bright chalcedony chemical closeup color colorful colourful composition crystal diamond for gem gemstone geological geology glisten iridescent jewel jewelry macro material miner mineral mineralogy mining natural nature nobody nugget onyx oxide precious projects quartz rare raw resource rock science semiprecious shaft shine shiny sio2 solid specimen stone successful translucent treasure unique variety with your