I have a mixture of salt (NaCl) + anhydrite + chalcopyrite + pyrite, and would like to dissolve them separately. Does anybody in this group know any acid-leaching method that I can use for this purpose? Can anhydrite be dissolved partly or totally in cold or hot pure water? Can pyrite be dissolved partly in dilute or concentrated HCl? Many thanks for your help. ***************************************** Dr. Shao-Yong Jiang Max-Planck-Institut fuer Chemie Abt. Geochemie Postfach 3060 D-55020 Mainz Germany fax: 49 - 6131 - 371051 phone: 49 - 6131 - 305394 email: [log in to unmask] *****************************************