An excellent example of older Naica material with grey/blue anhydrites at myriad angles back coated with gem calcites and minor sulfide dusting. The piece appears to be a floater, as all bottom terminations are complete. I cannot discern any broken crystals. Locality: Naica Mine, Naica, Municipia de Saucillo, Chihuahua, Mexico Composition: anhydrous calcium sulfate
