The structure of a selection of arsenate‐and sulphate‐based minerals of the tsumcorite group was studied by the combination of Raman and infrared spectroscopy. A comparison is made with the sulphate‐bearing mineral natrochalcite. Isomorphic substitution of sulphate for arsenate is observed for gartrellite and thometzekite. The positions of the hydroxyl and water stretching vibrations are related to the strength of the hydrogen bond formed between the OH unit and the AsO 4 anion. Estimates of the hydrogen bond distances are calculated using a Libowitzky‐type function. Characteristic Raman spectra of the minerals allow the assignment of the bands to specific vibrational modes.
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Frost et al. (2004) studied this question.
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