... absorption line for the impurities existenceZooming check: strong birefringence,cleavageSpecial optical effect: Cat's eyeOptimization process: -Dyeing:dyed into different color ... calcium plastics, cables, paper, toothpaste, cosmetics, glass, pharmaceuticals, paint, ink, cable, electricity insulation, food, textile , feed, adhesives, sealants, asphalt, building materials ...