The New Encyclopaedia Britannica: A - K.Encyclopaedia Britannica, 2005 |
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Page 186
... feldspar two feldspars 300 0 20 40 60 80 percent Ab by weight 100 18 2 Ab in discussions involving their end - member composition . Albite ( NaAlSi , O , -usually designated Ab ) and anorthite ( CaAl Si2O - An ) are end - members of the ...
... feldspar two feldspars 300 0 20 40 60 80 percent Ab by weight 100 18 2 Ab in discussions involving their end - member composition . Albite ( NaAlSi , O , -usually designated Ab ) and anorthite ( CaAl Si2O - An ) are end - members of the ...
Page 187
... feldspars Table. feldspars by sodium - bearing fluids . In any case , perthite is the name properly applied to intimate mixtures in which the potassium feldspar component predominates over the plagioclase constituent , whereas ...
... feldspars Table. feldspars by sodium - bearing fluids . In any case , perthite is the name properly applied to intimate mixtures in which the potassium feldspar component predominates over the plagioclase constituent , whereas ...
Page 256
... feldspar ( and feldspar grains are in excess of rock fragments ) , the rock is termed arkosic arenite or " arkose , " although such sandstones are also somewhat loosely re- ferred to as feldspathic sandstones . In subarkosic arenite ...
... feldspar ( and feldspar grains are in excess of rock fragments ) , the rock is termed arkosic arenite or " arkose , " although such sandstones are also somewhat loosely re- ferred to as feldspathic sandstones . In subarkosic arenite ...
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