Abstract
Two different types of APS minerals are described for the first time from the Desa Toraget kaolin deposit (Sulawesi, Indonesia). Type I is a near end member alunite with some PO 4 3− substituting for (SO 4) 2−. The second type contains Ca at a maximum of 0.28 in the structural formula and as a consequence of this, phosphate (−0.47) increased at the expense of SO 4 2− (1.53). The compositional data attest to a solid solution between woodhouseite and pure alunite. Desa Toraget kaolin mineralization, hence may be classified as “advanced argillic alteration” which requires high oxidation and sulfidation and is related in time and space to the Quaternary volcanic activity. In view of the genetic linkage between epithermal Au mineralization and high sulphidation kaolinitic alteration elsewhere, the study area might be considered as a potential target for Au exploration.
Published Version
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