It is the main chemical composition of sio2. Patent for SiO2. Crystal shows colorless, purple, yellow, green and smoked, etc. Vitreous burnish. Transparent to the translucent. Hardness 7. Sex brittle. No cleavage. Crystal density: 2.56-2.66 g/cubic centimeters. Crystal refractive index: 1.544-1.553, almost no outside this range. Crystal dispersion: 0.013. Crystal melting point for 1713 ℃.
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