Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
Spectrochim Acta A Mol Biomol Spectrosc. 2011 Oct 15;81(1):111-6. doi: 10.1016/j.saa.2011.05.059. Epub 2011 Jun 15.
The mixed anion mineral parnauite Cu(9)[(OH)(10)|SO(4)|(AsO(4))(2)]·7H(2)O from two localities namely Cap Garonne Mine, Le Pradet, France and Majuba Hill mine, Pershing County, Nevada, USA has been studied by Raman spectroscopy. The Raman spectrum of the French sample is dominated by an intense band at 975 cm(-1) assigned to the ν(1) (SO(4))(2-) symmetric stretching mode and Raman bands at 1077 and 1097 cm(-1) may be attributed to the ν(3) (SO(4))(2-) antisymmetric stretching mode. Two Raman bands 1107 and 1126 cm(-1) are assigned to carbonate CO(3)(2-) symmetric stretching bands and confirms the presence of carbonate in the structure of parnauite. The comparatively sharp band for the Pershing County mineral at 976 cm(-1) is assigned to the ν(1) (SO(4))(2-) symmetric stretching mode and a broad spectral profile centered upon 1097 cm(-1) is attributed to the ν(3) (SO(4))(2-) antisymmetric stretching mode. Two intense bands for the Pershing County mineral at 851 and 810 cm(-1) are assigned to the ν(1) (AsO(4))(3-) symmetric stretching and ν(3) (AsO(4))(3-) antisymmetric stretching modes. Two Raman bands for the French mineral observed at 725 and 777 cm(-1) are attributed to the ν(3) (AsO(4))(3-) antisymmetric stretching mode. For the French mineral, a low intensity Raman band is observed at 869 cm(-1) and is assigned to the ν(1) (AsO(4))(3-) symmetric stretching vibration. Chemical composition of parnauite remains open and the question may be raised is parnauite a solid solution of two or more minerals such as a copper hydroxy-arsenate and a copper hydroxy sulphate.
来自法国加龙河畔普拉代特的卡普加隆矿和美国内华达州普辛格县的马朱巴山矿的混合阴离子矿物磷钠钙石 Cu(9)[(OH)(10)|SO(4)|(AsO(4))(2)]·7H(2)O 通过拉曼光谱进行了研究。法国样品的拉曼光谱主要由一个位于 975 cm(-1) 的强带支配，该带归因于 ν(1) (SO(4))(2-)对称伸缩模式，而位于 1077 和 1097 cm(-1) 的拉曼带可能归因于 ν(3) (SO(4))(2-)反对称伸缩模式。两个拉曼带 1107 和 1126 cm(-1) 被分配给碳酸盐 CO(3)(2-)对称伸缩带，并证实了碳酸盐在磷钠钙石结构中的存在。佩尔森县矿物的相对尖锐的 976 cm(-1) 带被分配给 ν(1) (SO(4))(2-)对称伸缩模式，而中心位于 1097 cm(-1) 的宽光谱轮廓归因于 ν(3) (SO(4))(2-)反对称伸缩模式。佩尔森县矿物的两个强烈带 851 和 810 cm(-1) 被分配给 ν(1) (AsO(4))(3-)对称伸缩和 ν(3) (AsO(4))(3-)反对称伸缩模式。法国矿物观察到的两个拉曼带位于 725 和 777 cm(-1) ，归因于 ν(3) (AsO(4))(3-)反对称伸缩模式。对于法国矿物，在 869 cm(-1) 处观察到一个低强度拉曼带，归因于 ν(1) (AsO(4))(3-)对称伸缩振动。磷钠钙石的化学成分仍然存在争议，可能会提出这样一个问题，即磷钠钙石是否是两种或更多种矿物的固溶体，例如铜羟砷酸盐和铜羟硫酸盐。
