of quartz sio2 from the mohs scale of mineral hardness on the background from connected molecules

abstract amethyst background beautiful beauty birthstone color colorful connected crystal decoration detail druse gem gemstone geological geology hardness healing illustration isolated jewel jewelry mineral mineralogy mining mohs molecules natural nature pebble pink precious purple quartz raw rock rough scale science semiprecious shiny silica silicon sio2 sparkle stone structural structure symbol texture translucent transparent vector violet