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DOI: 10.1177/1420326X9900800202
Crystalline Silica: Occurrence and UseMorgan Crucible Co. plc, Stourport-on-Severn, UK Silica is the natural compound of the two most abundant elements on Earth - oxygen and silicon. It occurs in amorphous and crystalline forms, the most common of which is quartz. Quartz accounts for about 12 wt% of the Earth's crust and is present in all major rock types and top soils. Crystalline silica-containing airborne dusts are ubiquitous in the human environment, coming from un- consolidated materials on the Earth's surface, from natu ral raw materials processed by industry, and from many materials of construction.
Key Words: Quartz Tridymite Cristobalite Coesite Stishovite
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