"Structure of pumice: An XPS and 27Al MAS NMR study". The larger the permeability, the more fluid flow can be achieved through the medium for a given set of conditions. " Underwater volcano creates huge floating islands of rock, disrupts shipping". Rock permeability Permeability is defined as the ability of a porous medium, e.g., sedimentary rock, to conduct fluids. University of Tasmania, Hobart, Tasmania. the rock and pressure is maintained at a constant level (b) undrained, where the mass of the fluid inside the rock stays the same so the pressure is changing and (c) unjacketed, where increments of pore pressure and mean stress are equal. The dolomites have the lowest porosities (26), the shales have the widest range of. The data table lists the porosities of the tested samples and the figure at right shows the range and distribution of porosities by lithology. The porosities of the rocks measured vary from 2 to more than 30.Much of this variation is due to lithology (rock type). Centre for Ore Deposit and Exploration Studies. Porosity measurements of Wisconsin rocks. Volcanic Textures: A guide to the interpretation of textures in volcanic rocks. "Pumice rafting and faunal dispersion during 2001–2002 in the Southwest Pacific: record of a dacitic submarine explosive eruption from Tonga." Earth and Planetary Science Letters.
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