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Caused by the inhalation of dust of silicon dioxide, Lahore (Sillicon dioxide) into
(silica, silica oxide chemical formula is SiO2 melting 1,700 oC Boiling 2,230 oC solid colorless crystal structure 5 forms in nature in the form of sand. Metz court and some stones used in the manufacture of glass, abrasives, refractories and ceramic products, etc.).
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