gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1984.048.349.13 Short Communications Perrierite in Siliceous Lavas from Mt Amiata, Central Italy van Bergen Manfred J. Vening Meinesz Laboratory, Dept. of Geochemistry, Institute of Earth Sciences, State University of Utrecht, Budapestlaan 4, 3584 CD Utrecht, The Netherlands 12 1984 48 349 553 556 6 12 1983 8 2 1984 Copyright © 1984, The Mineralogical Society 1984