Fluorite with Chalcopyrite & Radiation Induced Spots
Purple-blue Fluorites containing numerous, prominent dark spots. These occur due to local, tiny ingrown bits of radioactive material that excites the electrons of some fluorite molecules around them and causes a permanent “smoky” effect as happens also in smoky quartz. It is very rare to see this dispersed pinpoint phenomenon in fluorite!
Rosiclare Level, Denton Mine, Harris Creek, Hardin Co., Illinois, USA