... mine is usually colorless and transparent crystal state2.hardness 7.8, specific gravity 4.6-4.71, 1 ... , normally because of the different Country of Origin with the different types and quantity of impurities, resulting ... yellow, orange, red, brown and other colors, hardness 7.8, specific gravity 4.6-4.71, 1.93 ... potassium, zirconium sulfate, etc.). High quality Zirconium Sand with best price