rainbow fluorite -beautiful polished banded slice from south africa

africa ainbow amazing banded beautiful blue calcium closeup colorful crystal crystalline decoration detail enchanting fluoride fluorite from geology geometrical green halides hues hydrothermal impurities isolated isometric known luminous min mineral mineralogy most multicolored natural nature ore pattern polished purple rainbow rock science sedimentary semiprecious shining slice south stone stones structure system translucent transparent treasure veins yellow