he simplest silicon carbide manufacturing method involves melting silica sand and carbon, such as coal, at high temperatures―up to 2500 degrees Celsius. Darker, more common versions of silicon carbide often include iron and carbon impurities, but pure SiC crystals are colorless and form when silicon carbide sublimes at 2700 degrees Celsius. Once heated, these crystals deposit onto graphite at a cooler temperature in a process known as the Lely method. http://www.runjinrefractories.com/silicon-carbide-products/

The modern coke oven is a large-scale thermal equipment built of tens of thousands of tons, nearly thousands brick-type refractory materials, which the amount of silica bricks account for 60%~70%. The silica brick for coke oven is mainly composed of tridymite, which is mainly used for building regenerator walls, chutes, combustion chambers, carbonization chambers and furnace roofs of coke ovens. http://www.runjinrefractories.com/refractory-brick/

Basalt is an extrusive igneous or volcanic rock that has a low silica content, dark in colour, and is very rich in iron and magnesium. Basalt rock is mainly composed of pyroxene, olivine, and plagioclase and is the most common rock on the earth's surface. The texture of basalt rocks is coarsely porous as those holes are left by gas bubbles.http://www.hzxstone.com/sandstone/