A Treatise on Ore DepositsD. Van Nostrand, 1870 - 574 pàgines |
Continguts
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Altres edicions - Mostra-ho tot
Frases i termes més freqüents
appears argentiferous beds Berg bismuth blende breadth broad brown spar Buntsandstein calc Carboniferous cerusite chiefly chlorite clay clay-slate cobalt combined consists contain copper glance copper pyrites copper-slate country rock crystalline schists crystals decomposition depth Devonian dikes direction of strike district dolomite encrease Erzgebirge exploited fathoms feet feldspar fissures fluor spar formation formed fragments Freiberg frequently galena geodes Geogn geological gneiss gold granite granular greenstones greisen Hartz heavy spar hematite hornstone hüttenm igneous rocks impregnations inches intersect iron pyrites Ironstone irregular Jahrb layers Leonhard's limestone limonite malachite manganese mass matrix metalliferous mica mica-schist minerals mines mispickel mountains native silver nearly neighborhood nickel numerous ore-deposits ORE-DISTRICT parallel partly penetrated porphyry portion principally psilomelane pyrolusite quartz ruby silver sandstone schist segregations shales siliceous slate Silurian silver glance smithsonite spathic iron specular iron strata strike and dip surface tetrahedrite texture thick tion traversed veins wall-rock Zechstein zone