close-up of agate stone with gray and white crystal structures

crystallization geologicalrock geodecrystals naturalstone crystalline rawmaterial reflections structures background earthtones geological mineralogy prismatic patterned stonework landscape sandgrain sandstone structure crystals granular precious closeup crystal faceted surface geology mineral natural outdoor pattern texture shapes stones detail earthy facets geodes smooth agate stone white shiny sandy color earth geode jewel prism rocks rough gray land sand raw gem