Silica and quartz stone is the same substance

Silica:
Including quartz, quartzite, quartz sandstone, mainly in the Ka-Xiang, Yulin Pingxiang, on the social and Sipan rural towns and other places. Quartz sandstone fairy rural village located in the area only. No geological exploration data, according to the mine deposits outcrop length and width, the estimated geological reserves of about 50 million tons. Picking block under each mine laboratory analysis, silica containing about 96-99 percent. Mine existing mining point ten. Of approximately 30,000 tons of ore mined. Silica is mainly used for glass, ceramics, smelting, ferrosilicon, silicon, silicon transfer and so on.
Quartz:
Chemical formula Si02, often contain a small amount of impurities such as A1203, IMO,, CaO, Mg0, etc. There are various types. Ceramics are used in raw materials quartz, quartz sand, quartzite, sandstone, silica, opal, diatomaceous earth, etc., are also rich in rice shell gray Si02. Often has the appearance of white quartz, white, gray translucent state, Mohs hardness of 7, broken glass mask shiny gloss or fat, the proportion varies due to crystal, changes in between 2.22-2.65.
Quartz is a physical and chemical properties of mineral resources are very stable, crystal belongs to trigonal system of oxide minerals, ie, low temperature quartz (a-quartz), quartz the most widely distributed group minerals in a mineral species. Generalized include a high-temperature quartz quartz (b-quartz). Quartz block, also known as silica, is the production of quartz sand (also known as silica sand) of raw materials, but also quartz refractories and firing ferrosilicon raw materials.