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1Yell-Sift Duties 41 <br />• <br />• <br />i <br /> ROUNDN ESS <br /> <br />~'~ <br />N~~~% A ~ <br />y I <br />'' ~ <br />lr r'~ <br />\ F <br />-~ <br />~ `r Ill <br />.~ <br />\. <br />1~~~ <br />~ <br /> <br /> <br />\ ~~ <br /> <br />1 ~ <br />\ll i, <br />~i~ I~' <br />' / <br />' '" <br />~ <br />~ <br />I~ <br />/'\~ <br />\.1 <br /> ~a~ r,~ , ~ <br /> , ,'- <br /> VERY ANGULAR ANGULAR SUB-ANGULAR SUB-RWNDED ROUNDED WELL-ROUNDED <br /> <br /> SPHERICITY <br />® !~ ® ~ <br /> <br />~~ ~ ~ ~ ~ ~ <br /> 0~5 0~6 0~7 0~6 0~9 I~O <br />045 055 065 075 085 0'95 <br />VERY <br />ELONGATED <br />ELONGATED SLIGHTLY <br />ELONGATED SLIGHTLY <br />SPHERICAL <br />SPHERICAL VERY <br />SPHERICAL <br /> <br /> <br /> HARDNESS <br />MOH~S SCALE <br />HARDNESS: STANDARD MINERAL : SUGGESTED HARDNE SS QUALIFIERS: <br />1 TALC LOOSE: Groins loll apart in dry condition <br />2 ROCK SALT, or GYPSUM FRIABLE: Rock crumbles easily between lin gers <br />3 CALCITE MODERATELY HARD: Grains can be deloche0 with pick <br />4 FLUOR-SPAR HARD: Grains cannot be detached with pick <br />5 APATITE SOFT: <br />6 ORTHOCLASE FELDS PAR PLASTIC: e.q. clay <br />7 OUART2 BRITTLE: e.q. coal <br />B TOPAZ <br />9 CORRUNDUM <br />10 DIAMOND <br />Fig. ]0 Roundness, sphericity, and hardness charts <br />