. Jefferson, Berkeley, and Morgan counties, by Grimsley, assistant geologist. White, state geologist. te minerals, especially feldspar, components ofthe so-called hard or crystalline rocks. The feldspar family isone of many members and complex composition, made upessentially of the chemical elements, lime, potassium, sodium,aluminum, silicon, and oxygen. The potash feldspar (ortho-clase) and those high in lime (albite) through alteration formthe mineral kaolin which is the basis of clay. Pure kaolin is awhite clay and is chemically a potash aluminum silicate whichis mined in consider
. Jefferson, Berkeley, and Morgan counties, by Grimsley, assistant geologist. White, state geologist. te minerals, especially feldspar, components ofthe so-called hard or crystalline rocks. The feldspar family isone of many members and complex composition, made upessentially of the chemical elements, lime, potassium, sodium,aluminum, silicon, and oxygen. The potash feldspar (ortho-clase) and those high in lime (albite) through alteration formthe mineral kaolin which is the basis of clay. Pure kaolin is awhite clay and is chemically a potash aluminum silicate whichis mined in considerable quantity in a number of southernStates and is used in the manufacture of fine table and orna-mental chinaware. All snow-white clays are not kaolin andhere and there over the eastern Panhandle Area are foundsmall deposits of bleached white clay popularly called kaolin,but they usually contain too many impurities for this purevariety. The various alterations of rocks under atmospheric andaqueous agencies are included under the term great agenl of change in the rocks in the surface portion. PLATE XXXIII(A).—Harland Spring under Hill of Conococheague Lime-stone.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeology, bookyear1916
