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calcedony n.【礦物】玉髓。

calceiform

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 . 和闐玉摩氏硬度為6 . 56 . 9 ,用鋼刀刻不動,與其它玉石硬度相近的玉石有翡翠南陽玉玉髓等。