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52 <br />rti <br />Table 22 Base Friction Angles Putnam 1981 p 95 <br />Material residual <br />degrees <br />Source <br />Amphibolite dry 32 1 <br />Attapulgite 30 2 <br />Basalt dry 3538 1 <br />wet 3136 1 <br />Calcite crushed 30 2 <br />Chalk wet 30 1 <br />Conglomerate 35 3 <br />Dolomite dry 3137 1 <br />wet 2735 1 <br />Feldspar crushed 35 2 <br />Gneiss schistose 2329 1 <br />Granite 2935 1 <br />Kaolinite 15 2 <br />3Limestone3337 <br />4MelbourneMudstone2535 <br />2Montmorillonite410 <br />Muscovite 1724 2 <br />Quartz crushed 35 2 <br />Quartz Monzonite 32 <br />2534 <br />3 <br />3Sandstone <br />Sandstone clean diamond cut 36 5 <br />Sandstone bentonite coated <br />diamond cut 32 5 <br />Shale wet 27 1 <br />1 <br />Siltstone dry 3133 <br />1wet2731 <br />Slate dry 2530 1 <br />1 Reported by Barton 1973 <br />2 Kenney 1967 <br />3 Reported by Morgen stern 1968 <br />4 Parkin and Donald 1975 <br />5 Pells Rowe and T urner 1980