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The vein quartz is a collection of quartz (SiO2), which is milky white, grayish white, white, grease luster, dense block, specific gravity of about 2.65, melting point above 1700 °C, good temperature resistance, good acid and alkali resistance, poor thermal conductivity, high insulation. Low expansion, stable chemical properties, hardness greater than 7. The vein quartz is formed by the hot aqueous solution of SiO2 secreted by the underground magma and deposited in the cracks of the rock. The appearance is milky white, white, dense and hard. Quartz is crystalline, and the crystal grains are coarse, more than 2mm. The chemical composition is very pure, the SiO2 content is over 99%, the impurity composition is very small, and some are sandwiched with red or yellowish brown rust. When such silica is heated, the silica crystal form is difficult to change, and the crystal form is incompletely transformed, the expansion property is large, and it is easy to loose. The silicon brick is made of the raw material, and if the process conditions are improper, the product is prone to cracks or even cracks, and the pores are formed. The rate is high and the intensity is low. However, the product has good slag resistance.
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