| Show STONES ABSORB WATER stone is by no means impervious 0 0 wati water L some kinds notably coarse sandstones hold a large percentage even in marbles arbles absorb considerable sid erable quantities the absorptive ca capacity ot of lime stones ranges front from 7 percent per zent or more down to pra ly zero porous lime stones in which the pore space ranges from n 10 to 16 15 per cent will absorb from 4 to 6 per sent lent of water according to tile the united states geological survey department of the interior whereas semi crystalline and cryst crystalline crystallo allf tie lime stones or marbles have lave lower percentages cen of pore space and of absorption such marbles as those from vermont tennessee and georgia being behig almost nan absorbent pumice stone which Is usually lighter than water owing to its great amount of pore space will absorb large quantities of water obsidian and volcanic glass which are of the same chemical composition a as a pumice stone but several times heavier thail water will absorb none quartzite granite and the th numerous eruptive rocks are practically impervious to water |
