a milky or greyish translucent to transparent quartz 同义词：chalcedony,
例句与用法
1.
The jade is rubed the hardness is 6 with zhengdong . 5 - 6 . 9 , can not be carved with the steel knife , the malachite similar to hardness of other malachite is emerald , nanyang jade , calcedony , etc . 和阗玉摩氏硬度为6 . 56 . 9 ，用钢刀刻不动，与其它玉石硬度相近的玉石有翡翠南阳玉玉髓等。
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