Detail of "15468-32-3"

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CAS Number:
15468-32-3
Name:
Tridymite (SiO2) (9CI)
Molecular Structure:
Formula:
O2Si
Molecular Weight:
60.09
Synonyms:
Tridymite(8CI); Christensenite; Tridymite 118; a-Tridymite
Density:
g/cm³
Boiling Point:
°Cat760mmHg
Flash Point:
°C
Hazard Symbols:
TLV: (silica, crystalline) Respirable Fraction: 0.05 mg/m³.
Safety:
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. Details

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Some cristobalites and tridymites in geothermal area: Some cristobalites and tridymites in geothermal area. Kinbara, Keiji (Agency Ind. Sci. Technol., Japan). Chinetsu, 14(1), 13-20 (Japanese) 1977. CODEN: JJGTAD. DOCUMENT TYPE: Journal CA Section: 53 (Mineralogical and Geological Chemistry) Cristobalite [14464-46-1] and tridymite [15468-32-3] as well as quartz occur commonly in altered rocks of geothermal area. Two specimens of altered andesite from Kagoshima Prefecture (Ak) and that from Akita Prefecture (Aa), were studied. Both specimens have been completely replaced by .alpha.-cristobalite. The x-ray reflection lines of specimen Ak are sharp, but those of specimen Aa are obscure. The lattice consts. of cristobalite calcd. by the least square method are as follows: Ak a 4.983.ANG., c 6.945.ANG. and Aa a 4.989.ANG., c 6.953.ANG.. Chem. compn. (recalcd. value) of specimen Ak is given. .beta.-Cristobalite is rarely found in intense silicified rocks of geothermal area. These 2 specimens have been completely replaced by .alpha.-tridymite in assocn. with a small amt. of cristobalite.

A quantitative x-ray diffraction method for the determination of polymorphs in silica brick: A quantitative x-ray diffraction method for the determination of polymorphs in silica brick. Whelan, G. W. (Armco Steel Corp., Middletown, Ohio, USA). Can. J. Spectrosc., 21(6), 172-5 (English) 1976. CODEN: CJSPAI. DOCUMENT TYPE: Journal CA Section: 57 (Ceramics) Section cross-reference(s): 79 A quant. x-ray diffraction method for the detn. of .alpha.-quartz [14808-60-7], .alpha.-tridymite [15468-32-3] and .alpha.-cristobalite [14464-46-1] in SiO2 brick is described. Calibration curves for each SiO2 polymorph were generated from synthetic stds. and their equations are given. For quant. anal. of samples, peak areas for .alpha.-quartz (101), .alpha.-tridymite (200), and .alpha.-cristobalite (102) were detd. Concns. of each polymorph were detd. from these peak areas using the equations from synthetic std. calibration curves. Interference of .alpha.-tridymite (200) by .alpha.-quartz (100) was cor. for by substracting 17% .alpha.-quartz (101) intensity from the .alpha.-tridymite peak detn. SiO2 brick samples mech. ground and pressed into wafers had no significant preferred orientation.