摘要

We have studied the vibrational spectra of the mineral bayldonite, a hydroxy arsenate of copper and lead of formula Cu3Pb(ASO(3)OH)(2)(OH)(2) from the type locality, the Penberthy Croft Mine, St Hilary, Mount%26apos;s Bay District, Cornwall, England and relate the spectra to the mineral structure. Raman bands at 896 and 838 cm(-1) are assigned to the (AsO4)(3-) v(1) symmetric stretching mode and the second to the (AsO4)(3-) v(3) antisymmetric stretching mode. It is noted that the position of the symmetric stretching mode is at a higher position than the antisymmetric stretching mode. It is proposed that the Raman bands at 889 and 845 cm(-1) are symmetric and antisymmetric stretching modes of the (HOAsO3)(2-) units. Raman bands of bayldonite at 490 and 500 cm(-1) are assigned to the (AsO4)(3-) v(4) bending modes. Raman bands for bayldonite are noted at 396, 408 and 429 cm(-1) and are assigned to the (AsO4)(3-) v(2) bending modes. A comparison is made with spectra of the other basic copper arsenate minerals, namely cornubite, olivenite, cornwallite.

  • 出版日期2014-1-6