Learn about Chalcopyrite
brassy-gold, metallic crystals with disphenoid forms and rainbow tarnish; prized for luster, contrast, and localities like Dalnegorsk.Illinois-Kentucky Fluorspar District
Illinois-Kentucky Fluorspar District, USA — historic fluorite belt known for color-zoned, glassy cubes with calcite and sphalerite; prized Denton-style specime…
Comments