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Quartz Based Industries (Quartz Powder, Silica Sand, Silica Ramming Mass & Fused Silica) [Eiri-1339]
Silica. The most common occurrence of silica (qv) is in the form of quartz. Other forms which are found in nature are tridymite, cristobalite, vitreous silica, cryptocrystalline forms (usually as pebbles in chalk), hydrated silica and diatomite. The principal sources of silica used in the ceramic industry are the sandstones, quartzites, and sands. Quartzites, often called ganister, are firmly consolidated sandstones, whereas sandstones are rather lightly bonded quartz grains or sands. Silica is the primary ingredient in glass and is usually obtained from high purity sandstones or quartzites by crushing and grinding, or from high-grade sand deposits. The term glass sand may refer to a deposit of sand or, more commonly it is used to refer to the sand after it has been beneficiated from sandstones, quartzites, or natural sands. Flint or potter's flint in the strictest usage refers to flint pebbles usually occurring in calcareous or chalk deposits. It is a microcrystalline form of silica with a small amount of combined water. More generally, flint is used to designate either the true flint or quartz.