specimen of quartz columnar habit from mining and quarrying industries. quartz is a mineral composed of silicon and oxygen atoms

black calcite carbonate cave cavern cenote chalcedony collectable color column columnar crystal crystalline crystallize dark deposit dioxide education facet formation gem gemology gemstone geology jewelry manganese manufacturing mineral mineralogy mining mystic needle ore pattern precious quarry quartz rock sample science shape shiny silica silicate specimen stalactite stalagmite stone tourmaline