Economic Geology and the Bulletin of the Society of Economic Geologists, Volume 43

acid albite alteration appears argentite argillite associated batholith bauxite beds bomb boulangerite breccia Bull calcite carbonate cassiterite chalcopyrite chemical chromite chromitite clay coal coarse color composition concentration contains copper crystals curve deposits depth dikes district ECON experiments faults feet feldspar fluid fluorite formation formed fractures fusinized galena Geol geologist Geology gradient grains granite heat hole huebnerite hydrothermal hypogene Idaho igneous inclusions indicate intrusion iron kaliophilite kg/cm² limestone liquid magma magnetite material metals metamorphic meters microcline microscope minerals Mines muscovite Muzo occur orthoclase Oruro oxidation Pachuca pegmatites percent phase phyterals plagioclase porphyry potassium present pressure proustite pyrite quartz quartzite reaction Real del Monte replacement rocks San José sericite serpentine silica silver sodium solubility solutions specimens sphalerite structure sulfide sulphide surface Table tbls temperature tetrahedrite texture tion U. S. Geological Survey veinlets veins vitrinized volcanic xanthoconite zinc zinkenite zone