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单词 silica
释义
silica

Chemistry
  • See silicon(IV) oxide.


Geology and Earth Sciences
  • Silicon dioxide (SiO2) which occurs naturally in three main forms: (a) crystalline silica includes the minerals quartz, tridymite, and cristobalite; (b) cryptocrystalline or very finely crystalline silica includes some chalcedony, chert, jasper, and flint; and (c) amorphous hydrated silica includes opal, diatomite, and some chalcedony. Coesite and stishovite are two high-density polymorphs of quartz which rarely occur in nature but have been synthesized experimentally.


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