| 单词 | quartz |
| 释义 | quartz The most abundant and common mineral, consisting of crystalline silica (silicon dioxide, SiO2), crystallizing in the trigonal system. It has a hardness of 7 on the Mohs' scale. The mineral has the property of being piezoelectric and hence is used to make oscillators for clocks (see quartz clock), radios, and radar instruments. It is also used in optical instruments and in glass, glaze, and abrasives |
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