... hardness 7.8, specific gravity 4.6-4.71, 1.93-2.01 refra 1,Country of Origin: Australia, Indonesia, ... 0.10%≤0.20%≤0.30%3, zircon sand from australia Introduction Pure zirconium sand is usually colorless and transparent ... yellow, orange, red, brown and other colors, hardness 7.8, specific gravity 4.6-4.71, 1.93-2. ... , sodium fluorozirconate, potassium, zirconium sulfate, etc.). zircon sand from australia