. Bulletin - New York State Museum. Science. 50 NEW YORK STATE MUSEUM Silver Ag Silver is found in nature quite pure though sometimes alloyed with gold, copper and other metals. Isometric crystals are of rather more frequent occurrence than in the case of gold; parallel groupings of cubes are quite common; these pass into distorted fernlike and wirelike forms similar to those shown in pi. 122. Silver is a soft, malleable metal, silver-white on the fresh fracture but tarnishing to dark gray or black. Silver occurs in veins traversing gneiss, schist, porphyry and other rocks and is also associat
. Bulletin - New York State Museum. Science. 50 NEW YORK STATE MUSEUM Silver Ag Silver is found in nature quite pure though sometimes alloyed with gold, copper and other metals. Isometric crystals are of rather more frequent occurrence than in the case of gold; parallel groupings of cubes are quite common; these pass into distorted fernlike and wirelike forms similar to those shown in pi. 122. Silver is a soft, malleable metal, silver-white on the fresh fracture but tarnishing to dark gray or black. Silver occurs in veins traversing gneiss, schist, porphyry and other rocks and is also associated with copper in calcite. It is commonly carried in small amounts by galena. Some of the more important localities where it is found are Kongsberg, Norway; Saxony; Peru; northern Mexico; also Michigan, Col- orado, Idaho, Montana and Arizona. An unsuccessful attempt to mine silver in the vicinity of Ossining was made early in the last century. Silver is used for much the same purposes as gold. Copper Cu Copper occurs in soft, red, malleable crystals of the isometric system, disseminated masses and sheets. The common crystal forms are the cube and tetrahexahedron alone or in combination as shown in fig. 159; distorted and twisted crystals pass from parallel groups to branching arborescent forms (pi. 132). Twins are quite common but are, however, almost invariably distorted. The luster is metal- lic and the color and streak red, the former often tarnished nearly black. Copper occurs in beds and veins with native silver and the various copper ores and is frequently found near dykes of igneous rock. In the Lake Superior region in northern Michigan it occurs in dolerite and sandstone associated with calcite, dato- lite, analcite, etc. Copper is largely used in electric work and in alloys such as brass, bronze, bell metal, German silver, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and ap
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