calcedony造句

• 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。