Silver Composition, Crystallization, Structure and Occurrence
Composition. Silver, frequently containing small amounts of alloyed copper and gold, more rarely traces of platinum, antimony, bismuth, mercury.
Crystallization. Isometric. Crystals commonly distorted and in branching, arborescent or reticulated groups.
Structure. Commonly in irregular masses, plates, scales, etc., at times as coarse or fine wire.
Physical Properties. H. = 2.5-3. G. = 10.1 – 11.1, pure 10.5 Malleable and ductile. Color silver-white, often tarnished to brown or gray – black.
Test. Easily fusible at 2 to bright globule. No oxide coating on charcoal. Easily soluble in nitric acid, giving on addition of hydrochloric acid a curdy white precipitate of silver chloride, which turns dark on exposure to light. Deposited from kits solution bye action of a clean copper plate.
Occurrence. Occurs usually as small irregular flakes and masses disseminated through various vein minerals, often invisible. Found associated with native copper, galena, argentite, chalcocite, the ruby silvers, tetrahedrite, calcite, barite, etc. While native silver is not an uncommon mineral, the larger part of the world’s output of the metal is obtained from is various compounds with sulfur, antimony, arsenic, etc. most of the native silver occurring in nature is probably secondary in its origin, having been derived by reduction from some of its compounds.
Native silver has been found in the United States with native copper in the copper mines of Lake Superior; in crystal groups at the Elkhorn Mine, Montana; in large quantities as platy masses, associated with various cobalt and nickel minerals, at Cobalt, Ontario, Canada. An important silver ore in the mines of Chihuahua, Guanajuato, Durango, and Sonora, Mexico. Was found in large masses, one of which weighed 500 pounds, in the mines at Kongsberg, Norway. One of the ores of the silver mines of Saxony and Bohemia.
Use. Silver is used for ornamental purposes, for coinage, plating, etc. it is usually alloyed with copper. The standard silver coin in the United States contains one part of copper to nine parts of silver.
Grinding Rods (new) Cerargyrite & Embolite Composition, Crystallization & Structure Nitrates - Soda Niter Composition and Structure Crystallography, Optical Properties and Cleavage Platinum Element, Alloys and Symbols Overflow Ball Mill Capacities Short Tons Per 24 Hr. Mining Glossary T Wooden Sampling Template Identifying Lead Minerals Geochemical prospecting Single and Multi Stage Grinding How to Sample a Drill Hole Isometric System, Crystallographic Axes, Symmetry and Forms Lepidomelane Composition, Crystallization & Structure USED MINING EQUIPMENT AUSTRALIA
