Silica minerals

Silica (SiO2) occurs naturally in at least nine different varieties (polymorphs), which include tridymite (high-, middle-, and low-temperature forms), cristobalite (high- and low-temperature forms), coesite, and stishovite, in addition to high (β) and low (α) quartz (Fig. 1). These forms have distin...

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Bibliographic Details
Main Author: John C. Drake
Format: Reference Entry
Language:English
Online Access:Request full text
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Summary:Silica (SiO2) occurs naturally in at least nine different varieties (polymorphs), which include tridymite (high-, middle-, and low-temperature forms), cristobalite (high- and low-temperature forms), coesite, and stishovite, in addition to high (β) and low (α) quartz (Fig. 1). These forms have distinctive crystallography, optical characteristics, physical properties, pressure-temperature stability ranges, and occurrences (see table).
DOI:10.1036/1097-8542.622400