The New Encyclopaedia Britannica: A - K.Encyclopaedia Britannica, 2005 |
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Page 165
... crystals . ( A ) Sixfold axis of rotation ( 6 ) . ( B ) Fourfold axis of inversion ( 4 ) . ( C ) Centre of symmetry ( i ) . ( D ) Mirror plane ( m ) . From C. Klein and C.S. Hurlbut , Jr. , Manual of Mineralogy ( 1985 ) , reprinted with ...
... crystals . ( A ) Sixfold axis of rotation ( 6 ) . ( B ) Fourfold axis of inversion ( 4 ) . ( C ) Centre of symmetry ( i ) . ( D ) Mirror plane ( m ) . From C. Klein and C.S. Hurlbut , Jr. , Manual of Mineralogy ( 1985 ) , reprinted with ...
Page 166
... crystals can be studied with the unaided eye in large well - developed crystals and has been historically examined in considerable detail by optical measurements of smaller well - formed crystals through the use of optical goniometers ...
... crystals can be studied with the unaided eye in large well - developed crystals and has been historically examined in considerable detail by optical measurements of smaller well - formed crystals through the use of optical goniometers ...
Page 198
... crystals to occur as two types : left - handed or right - handed ( enan- tiomorphism ) . Left - handed quartz is less than 1 percent more abundant than right - handed quartz . The structural tetrahedrons spiral upward through the crystal ...
... crystals to occur as two types : left - handed or right - handed ( enan- tiomorphism ) . Left - handed quartz is less than 1 percent more abundant than right - handed quartz . The structural tetrahedrons spiral upward through the crystal ...
Common terms and phrases
albite amphiboles ancient aragonite areas atoms basalt bivalves body calcite calcium called carbonate central centre century cephalopods chemical clay minerals colour common composition contain crust crystals ctenidia cult cultural deities deposits developed dolomite Earth economic eggs electron evaporite example existence facies feldspar Figure garnet gastropods goddess gods grains Hittite human igneous rocks important industrial kaolinite king known layers limestone magma magnetic major mantle cavity marine material mental metamorphic rocks metaphysics Mexican Mexico City mica Michelangelo microscope millimetres Milton mimicry mind Mineralogy modern Molière Mongolia Mongols Moscow myth nature object occur ocean olivine organic originally oxide percent period philosophers physical plagioclase political population pressure produced properties pyroxene quartz reaction region religion religious reprinted result sandstones sedimentary rocks sediments shell silicate smectite snails society species structure Sumerian surface temperature temple tetrahedrons texture tion typically United urban volcanic