TL;DR: In this article, a combination of electron probe analysis to determine the molecular formula of the mineral and the structure assessed by vibrational spectroscopy was used to compare with that of the alums.
TL;DR: The CREEDITE, Ca3Al2(SO4)(OH)2F8·2H2O, is a calcium aluminium sulfate fluoro-hydroxide that forms colorless to white to purple, monoclinic prismatic crystals, frequently in acicular radiating sprays of...
Abstract: CREEDITE, Ca3Al2(SO4)(OH)2F8·2H2O, is a calcium aluminium sulfate fluoro-hydroxide. It forms colorless to white to purple, monoclinic prismatic crystals, frequently in acicular radiating sprays of ...