a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite
silica的用法和樣例：
例句
用作名詞 (n.)
Silica, in fact, is a desirable impurity because it is one of the reactants. 硅石實際上是一種有用的雜質，因為它是一種反應劑。
Our company has our own silia stone moutain and silica powder producing plant. 我公司有自己的硅石礦山和硅石粉加工廠。
The government sets up new health standard for respirable silica dust in the air of workplace. 政府出台了新的工作場所空氣呼吸性矽塵衛生標準。
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