Macro photograph of a slab of fluorite (calcium fluoride) from the Jiangxi Province in China Image #2511 3200 X 4800 pixels
A combination of purple amethyst and white quartz; Africa Image #3830 3721 X 5979 pixels
Velvety soft blue masses of azurite are formed from the weathering of copper minerals. Used as a pigment by Renaissance painters. Image #3352 4800 X 3200 pixels
