tridymite

Confirmed carcinogen with experimental tumorigenic data. Poison by intratracheal route. Human systemic effects by inhalation: cough, dyspnea. About twice as toxic as silica in causing silicosis. Mutation data reported. See also SILICA, AMORPHOUS FUME; SILICA, AMORPHOUS FUMED; SILICA, AMORPHOUS HYDRATED; SILICA, CRYSTALLINE; SILICA, CRYSTALLINE–CRISTOBALITE; SILICA, CRYSTALLINE–QUARTZ; SILICA FLOUR; SILICA, FUSED; SILICA, GEL and AMORPHOUS–PRECIPITATED.Analytical Methods: For occupational chemical analysis use OSHA: #ID-125G or NIOSH: Silica, crystalline (XRD), 7500; (Color), 7601; (IR), 7602.