Fluorite
available$700
Yellow cubic Fluorite crystal with an outer layer of glass-like blue coloration. The crystal has minor edge chipping and inclusions of shiny metallic golden Chalcopyrite crystals. This is the good stuff that makes Illinois Fluorite so famous! From old stock originally purchased from Ross Lillie decades ago. Note that the camera picked up a little red - the yellow is more lemon yellow and the blue layer is glassy sky blue.