gypsum rock specimen from mining and quarrying industries. gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate.

acute agate angle background beautiful beauty calcium cave clear cold color crystal crystalline crystallization crystallography curiosity diamond dihydrate gem geology grotto gypsum jewel jewelry karst laminated limpid luxury mine mineral mining precious quarry reflection refraction rock salt science shiny silica specimen speleology stone sulfate topaz transparent treasure volcanic wealth yellow