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air separator anthracite ball milling bituminous coal Boghead cannel coal boghead coal Bureau of Mines cement clinker chalcedony chalcopyrite channel channel-roller pulverizer chert and Babbitt circulating load cleavage or fracture conchoidal fracture contrast crushing rate crushing resistance crystallization curves of topaz distribution curves energy finer-size fracture and tetragonal grind a unit grinding characteristics grinding resistance Ground product hard to crush hardness 3.5 higher grinding rate impression that superfine Initial jet grinder Joplin chert limestone required low crushing MESH 65 metal surfaces mica mineral products minerals discussed Minerals with prominent Minus North Carolina muscovite percent perfect cleavage prominent cleavage pulverizer gave Pulverizer Tet grinder quartz reduction required to grind reverse curvature roller pulverizer Routine grinding tests rutile siderite and limestone Soft Georgia kaolin Southern Experiment Station specific gravity steam-jet grinder Substance hardness superfine grinding taconite Talc Sphalerite top limiting Tuscaloosa type of breakage uneven fracture unit volume weight zircon