Abstract
AbstractThe mineral ardealite Ca2(HPO4)(SO4)·4H2O is a ‘cave’ mineral and is formed through the reaction of calcite with bat guano. The mineral shows disorder and the composition varies depending on the origin of the mineral. Raman spectroscopy complimented with infrared spectroscopy has been used to characterise the mineral ardealite. The Raman spectrum is very different from that of gypsum. Bands are assigned to SO42− and HPO42− stretching and bending modes. Copyright © 2011 John Wiley & Sons, Ltd.
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