Metal Sulfides, Basic and MonoSulfide Division, Galena Group Isometric
The sulfides of the metals are divided into the following groups:
- A. Basic Division;
- B. Monosulphide Division;
- C. Intermediate Division;
- D. Disulphide Division.
Basic Division
This division includes several rare compounds of silver or copper with antimony or arsenic such as dyscrasite, Ag3Sb to Ag6Sb; domeykite, Cu3As; algodonite, Cu6As; whitneyite, Cu9As.
Monoshulphide Division
Galena group. Isometric
Argentite. Silver glance
Composition. Silver sulphide, Ag2S = Sulfur 12.9, silver 87.1.
Crystallization. Isometric. Cube, dodecahedron and octahedron the most common forms. Crystals often distorted and arranged in branching or reticulated groups.
Structure. Commonly y massive, platy, earthy or as a coating. More rarely in crystals.
Physical Properties. H. = 2-2.5. G. = 7.3. Easily sectile, can be cut with a knife like lead. Metallic luster. Color and streak blackish lead-gray. Streak shining. Bright on fresh surface but on exposure becomes dull black, due to the formation of an earthy sulphide.
Test. easily fusible at 1.5 with intumescence. When fused alone on charcoal in O.F. gives off odor of sulfur dioxide and yield a globule of pure silver. Distinguished by these test and by its color, sectility and high specific gravity.
Occurrence. Argentite is the most important primary mineral of silver, although it may also have a secondary origin. Usually found in silver veins as small masses, often earthy or as a coating. Associated with native silver, the rugby silvers, polybasite, stephanite and other silver minerals; also galena. In the United States it w as an important ore in the mines of the Comstock Lode, Nevada; at present found in Nevada at Tonopah and elsewhere. Found also in some of the silver districts of Colorado. An important ore in the silver mines of Guanajuato and elsewhere in Mexico; in Peru, Chile and Bolivia. Important European localities of its occurrence are Freiberg in Saxony, Joachimsthal in Bohemia, Schemnitz and Kremnitz in Czechoslovakia, Kongsberg in Norway.
Use. An important ore of silver.
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