. Jefferson, Berkeley, and Morgan counties, by Grimsley, assistant geologist. White, state geologist. ition 2. 740 Keith explains the origin of these schists in the HarpersFerry Folio as follows : The schist was originally a diabase or volcanic rock composed ofcrystals of feldspar, pyroxene, olivine, magnetite and ilmenite. Theoriginal massive rock was altered by the tremendous pressure anddistortion which accompanied folding, so that the pyroxene becamechlorite, magnetite, and quartz; and the feldspar was crushed andpartly altered to quartz, chlorite, and muscovite. The new
. Jefferson, Berkeley, and Morgan counties, by Grimsley, assistant geologist. White, state geologist. ition 2. 740 Keith explains the origin of these schists in the HarpersFerry Folio as follows : The schist was originally a diabase or volcanic rock composed ofcrystals of feldspar, pyroxene, olivine, magnetite and ilmenite. Theoriginal massive rock was altered by the tremendous pressure anddistortion which accompanied folding, so that the pyroxene becamechlorite, magnetite, and quartz; and the feldspar was crushed andpartly altered to quartz, chlorite, and muscovite. The new mineralswere arranged parallel to one another and thus became a schist,characterized by the ease of splitting along these minerals. Theamount of alteration increases from the Blue Ridge to Catoctin Moun-tain. The diabase from which the schist was produced was a flow oflava along the surface. It is probable that there were several erup-tions of somewhat different character, resulting in the different schistswhich are now found. Such distinct eruptions can not be proved bythe facts discoverable in this a >> ;= ft OU u PART III. The Mineral Resources of the EasternPanhandle Area. CHAPTER XIII THE GLASS-SAND AND COAL RESOURCES OFTHE EASTERN PANHANDLE COUNTIES. GLASS-SANDS. Glass chemically is a fused mixture of alkaline silicates,alkaline earths, and metals; or in other words, it is usuallya sodium lime silicate. Almost three-fourths of the compo-sition of glass is silica, and about one-eighth is lime the mixture for the manufacture of glass, 52 to 62 percent, is silica or sand as illustrated in the following tablefrom Linton1, showing the proportions by weight of the dif-ferent ingredients used in the manufacture of different kindsof glass: Mineral Industry, Vol. 8, pp. 244-5; 1899. 322 THE GLASS-SAND AND COAL RESOURCES OF THE EASTERNPANHANDLE COUNTIES. Plate Window Green Lead Glass. Glass. Bottle Flint. Sand 100 100 Salt-cake (Na-SOJ 42 Soda-ash (Na,C03) 36
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeology, bookyear1916
