Abstract
The structure of a selection of arsenate and sulphate based minerals of the tsumcorite group has been studied by the combination of Raman and infrared spectroscopy. Isomorphic substitution of sulphate for arsenate is observed for gartrellite and thometzekite. A comparison is made with the sulphate bearing mineral natrochalcite. The position 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. Characteristic Raman spectra of the minerals enable the assignment of the bands to specific vibrational modes.
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