Sylvanite Group, Sykvanite Composition and Crystallization
Sykvanite
Composition. Terrullide of gold and silver (Au, Ag)TEs2. The ratio of the amounts of gold and silver varies somewhat; when Au : Ag = 1 :1 =Tellurium 62.1, gold 24.5, silver 13.4.
Crystallization. Monoclinic. Distinct crystals rare.
Structure. Usually bladed or granular. Often in skeleton forms deposited on rock surfaces and resembling writing in appearance.
Physical Properties. Perfect cleavage parallel to clinopicoid. H. = 1.5. G. = 8-8.2. brilliant metallic luster. Color silver- write. Streak gray.
Tests. Easily fusible (1). It a little of the powdered mineral is heated in concentrated sulfuric acid the solution assumes a deep red color (tellurium). When decomposed in nitric aid leaves a rustly-colored, spongy mass of gold, and the solution with hydrochloric acid gives white precipitate of sliver chloride. With sodium carbonate on charcoal gives a globule of gold and silver. Determined, by above tests, by its silver color and good cleavage.
Occurrence. A rare mineral, found with gold ores at Offenbaya a and Nagyag in Transylvania; Kalgorlie, West Australia; Cripple Creek, Colorado.
Name. derived from Transylvania, where it was first found.
Use. An ore of gold.
Crystallography, Optical Properties and Cleavage Wireline Drilling Factors Influencing Crusher Performance Reducing samples The Mining Team Gypsum, Salt, Potash and Coal Magmatic Deposits GALVANIC INTERACTIONS Bond Work Index Equation Roll Crusher Product Specifications & Caracteristics Tourmaline Composition, Crystallization & Structure Porphyry Copper Flowsheet Froth Flotation Depth Metallurgical Risks Gahnite Composition, Crystallization & Structure
