单词 | silica |
释义 | silica [`sil·ǝ·kǝ] MINERALOGY SiO2 Naturally occurring silicon dioxide; occurs in five crystalline polymorphs (quartz, tridymite, cristobalite, coesite, and stishovite), in cryptocrystalline form (as chalcedony), in amorphous and hydrated forms (as opal), and combined in silicates. |
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