Preparative Method and Analysis by OM, SEM and EPMA of Porous, Brittle and Low Permeability Rocks and Materials: The Case of Pumices Fabio Gamberini and Giovanni ValdrèMicrosc. Microanal. Microstruct., 6 5-6 (1995) 573-586DOI: https://doi.org/10.1051/mmm:1995149