Quartz sand is a kind of hard and wearable silicic acid mineral with stable chemical
properties. The main component is SiO2. The quartz sands are ivory
or without color and translucent. The hardness is 7. They are brittle and without
cleavage. They have the shell-like breaking part and the color of grease. The
relative density is 2.65. They have the textural anisotropy in chemical, thermal
and mechanical properties. They are not dissoluble in acid and slightly soluble
in KOK solution. The melting point is 1,750. They are ivory, light yellow, brown
and grey. They have rather high fireproof performance. Because of special physical
properties, chemical properties and strong resistance to acid medium, the
quartz sands play an important role in the base construction of highways, plastic
racetracks and artificial lawns.
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