I would greatly appreciate to have information or published references to complete alteration of bronze. I can not find examples of bronze materials that have been completely altered in soil conditions. Tin bronze has gone COMPLETELY, and only cuprite, cassiterite, and other secondary CU minerals are found. Please send examples or experimental studies of similar occurrences. Thanks Gilberto Artioli ---------------------------------------------------- Prof. Gilberto Artioli Dipartimento di Scienze della Terra Universita' degli Studi di Milano Sezione di Mineralogia Via Botticelli 23 I-20133 Milano tel: 39-02-5031 5609 fax: 39-02-5031 5597 personal e-mail: [log in to unmask] secretary e-mail: [log in to unmask] url: http://iummix.terra.unimi.it/~artioli/start.html -----------------------------------------------------