A Treatise on Ore DepositsD. Van Nostrand, 1870 - 574 páginas |
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Términos y frases comunes
appear argentiferous auriferous beds belong Berg blende breadth broad brown spar calc calc-spar Carboniferous caused chiefly chlorite clay clay-slate cobalt combined consists contain copper pyrites copper-ores country-rock crystalline schists crystals decomposition depth Devonian dikes direction of strike dissimilar distribution district dolomite enclosing rock encrease Erzgebirge extend fathoms feet feldspar filled fissures fluor spar formation formed fragments Freiberg frequently galena geodes geological gneiss gold granite granular greenstone heavy spar hematite hornblende hüttenm igneous rocks impregnations intersect iron pyrites irregular Jahrb layers Leonhard's limestone limonite lodes magnetite manner masses matrix metallic deposits metalliferous deposits mica mica-schist minerals mines mispickel Monoclin Monomet mountains nickel numerous observed occur older ORE-BEDS ore-deposits origin parallel partly penetrated porphyry portion principally quartz recent rich sandstone schist segregations Silurian silver slate smithsonite spathic iron specular iron strata strike and dip surface tetrahedrite texture thick tion traversed Trimet veins wall-rock zone