Use of Raman spectroscopy to characterize and distinguish minerals of the alunite supergroup


The alunite supergroup consists of more than 50 representative minerals with the general formula A B 3 (XO 4) 2 (OH) 6 , where A may be occupied by Na, is the trivalent cation , Al 3+ or Fe 3+ , but also Cu 2+ or Zn 2+ and X is the tetrahedral anion, S, P or As [1, 2]. The minerals of this supergroup form numerous complex solid solutions which crystallize… (More)


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