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DISCOVERY OF A POSSIBLE NATURAL CaCO_3(Ⅱ) MINERAL

Shen Zhongyue 1) \ Ye Ying 1) \ Lü Guanglie 2) \ Zhou Huaiyang 3) \ Ding Weiwei 1) 1)Department of Earth Science,Zhejiang University,Hangzhou\ 310027 2)Analysing and Testing Center of Zhejiang Unviersity,Hangzhou\ 310028 3)The 2nd  
CaCO 3(Ⅱ)is found in the surface sediment of South China Sea,at longitude 117°00′,north latitude 12°00′.With its chemical composition the same as calcite,aragonite and vaterite,they all are polymorgh of CaCO 3.As a natural mineral,the space group of CaCO 3(Ⅱ) is found to be P2 1/c,with a lattice parameter of a 0=0.6290±0.0002 nm, b 0= 0.4934 ±0.0002 nm, c 0=0.7979±0.0003 nm, β =107.571°±0.002°, Z =4.Volume of unit cell is 0.23605±0.1749 nm 3;theoretical calculated density 2.82 g/cm 3,measured density 2.76g/cm 3,and measured hardness H =4.The natural CaCO 3(Ⅱ)is a biological mineral being a component of a coral body formed under deep water environment with a relatively high hydrostatic pressure.
【CateGory Index】: P578
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