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Proustite
Proustite is a sulfosalt mineral consisting of silver sulfarsenide, Ag3 As S3, known also as ruby blende, light red silver, arsenic-silver blende or ruby silver ore, and an important source of the metal. It is closely allied to the corresponding sulfantimonide, pyrargyrite, from which it was distinguished by the chemical analyses of Joseph L. Proust (1754–1826) in 1804, after whom the mineral received its name. The prismatic crystals are often terminated by the scalenohedron and the obtuse rhombohedron, thus resembling calcite (dog-tooth-spar) in habit. The color is scarlet-vermilion and the luster adamantine; crystals are transparent and very brilliant, but on exposure to light they soon become dull black and opaque. The streak is scarlet, the hardness 2 to 2.5, and the specific gravity 5.57. Its transparency differs from specimen to specimen, but most are opaque or translucent. Proustite occurs in hydrothermal deposits as a phase in the oxidized and supergene zone. It ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ruby Blende
Ruby blende or garnete blende are two close trivial names for several dissimilar minerals,''Krivovichev V. G.'' Mineralogical glossary. Scientific editor . — St.Petersburg: St.Petersburg Univ. Publ. House. 2009. 556 p. — ISBN 978-5-288-04863-0 with their appearance sometimes imitating red-colored precious stones, primarily natural garnets or rubies.Although the term "ruby blende" is more common, the comparison with "garnet blende" seems more accurate. The vast majority of the mineral varieties listed below imitate garnet shades of red, but not ruby. In the scientific community, the systematic use of the term generally ended in the 19th century, with the transition to the modern system of naming minerals. Currently, both names are primarily used among mineral collectors and dealers, as well as geologists, miners and related trades. * Miargyrite is a rare steel-colored ore mineral with an internal garnet reflection, very fragile. * Pyrargyrite''Robert Jameson''. A System of M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sulfosalt Minerals
Sulfosalt minerals are sulfide minerals with the general formula , where *A represents a metal such as copper, lead, silver, iron, and rarely mercury (element), mercury, zinc, vanadium *B usually represents semi-metal such as arsenic, antimony, bismuth, and rarely germanium, or metals like tin and rarely vanadium *X is sulfur or rarely selenium and/or tellurium. The Strunz classification includes the sulfosalts in a ''sulfides and sulfosalts'' superclass. A group which have similar appearing formulas are the Sulfarsenide mineral, sulfarsenides (for example cobaltite (Co,Fe)AsS). In sulfarsenides the arsenic substitutes for sulfide anions whereas in the sulfosalts the arsenic substitutes for a metal cation.Klein, Cornelis and Cornelius S. Hurlbut (1985). ''Manual of Mineralogy'', 20th ed., John Wiley and Sons, New York . About 200 sulfosalt minerals are known. Examples include: File:Proustite (long prismatic crystal) - Chanarcillo, Copiapo Province, Atacama Region, Chile.jpg, As ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arsenic Blende
Arsenic blende or ''Arsenblende'' () is a trivial name that has partially fallen out of scientific use, used by mineralogists, as well as representatives of mining and craft professions in relation to at least two similar ore minerals — orpiment and realgar,''Krivovichev V. G.'' Mineralogical glossary. Scientific editor A. G. Bulakh. — St.Petersburg: St.Petersburg Univ. Publ. House. 2009. — 556 p. — ISBN 978-5-288-04863-0 in composition — arsenic sulfides. History of the term Both of these minerals, realgar and orpiment, have been mined for a very long time, for thousands of years. They were mined as natural dyes, as medicinal agents, and as preparations that were important in alchemical practice. Their use as pigments was very significant, both in pure form and in mixed form; for example, orpiment was constantly required to make up the green dye that was used to dye wool in the Middle Ages in Western Europe. Arsenic blende was used even more widely in medicine; for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Opacity (optics)
Opacity is the measure of impenetrability to electromagnetic or other kinds of radiation, especially visible light. In radiative transfer, it describes the absorption and scattering of radiation in a medium, such as a plasma, dielectric, shielding material, glass, etc. An opaque object is neither transparent (allowing all light to pass through) nor translucent (allowing some light to pass through). When light strikes an interface between two substances, in general, some may be reflected, some absorbed, some scattered, and the rest transmitted (also see refraction). Reflection can be diffuse, for example light reflecting off a white wall, or specular, for example light reflecting off a mirror. An opaque substance transmits no light, and therefore reflects, scatters, or absorbs all of it. Other categories of visual appearance, related to the perception of regular or diffuse reflection and transmission of light, have been organized under the concept of cesia in an order sys ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saxony
Saxony, officially the Free State of Saxony, is a landlocked state of Germany, bordering the states of Brandenburg, Saxony-Anhalt, Thuringia, and Bavaria, as well as the countries of Poland and the Czech Republic. Its capital is Dresden, and its largest city is Leipzig. Saxony is the List of German states by area, tenth largest of Germany's sixteen states, with an area of , and the List of German states by population, sixth most populous, with more than 4 million inhabitants. The term Saxony (other), Saxony has been in use for more than a millennium. It was used for the medieval Duchy of Saxony, the Electorate of Saxony of the Holy Roman Empire, the Kingdom of Saxony, and twice for a republic. The first Free State of Saxony was established in 1918 as a constituent state of the Weimar Republic. After World War II, it was under Soviet occupation before it became part of communist East Germany and was abolished by the government in 1952. Following German reunificat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marienberg, Saxony
Marienberg is a town in Germany. It was the district capital of the Mittlerer Erzgebirgskreis (Central Ore Mountains district) in the southern part of Saxony, and since August 2008 it has been part of the new district of Erzgebirgskreis. As of 2020, the town had 16,716 inhabitants. Location and design The town is situated on a plateau north of the Ore Mountains ridge, at an elevation between 460 and 891 metres above sea level. It is approximately 31 kilometres south of Chemnitz, to which it is connected via the Reitzenhain–Flöha railway, Flöha Valley Railway. The historical town centre follows a rectangular plan, imitating Italian renaissance. The centre is the market square, a square of 1.7 hectares in area. Marienberg and Pobershau were merged into the administrative unit (''Verwaltungsgemeinschaft'') of Marienberg, Pobershau has been incorporated into Marienberg with effect from 1 January 2012. Town districts Marienberg's districts are: *Marienberg *Ansprung *Gebirge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freiberg, Saxony
Freiberg () is a college town, university and former mining town in Saxony, Germany, with around 41,000 inhabitants. The city lies in the foreland of the Ore Mountains, in the Saxon urbanization axis, which runs along the northern edge of the Elster Mountains, Elster and Ore Mountains, stretching from Plauen in the southwest via Zwickau, Chemnitz and Freiberg to Dresden in the northeast. It sits on the Freiberger Mulde, a tributary of the Mulde River. It is a ''Große Kreisstadt'' (large district town), and the administrative seat of ''Landkreis Mittelsachsen'' (district Central Saxony). Freiberg is connected to Dresden by the S3 line of the Dresden S-Bahn. The entire historic center of the Silver City is under monument protection, and together with local monuments of mining history such as the ''Reiche Zeche'' ore mine, it has been part of the UNESCO World Heritage Site Ore Mountain Mining Region, Erzgebirge/Krušnohoří Mining Region since 2019 due to its exceptional testimo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chile
Chile, officially the Republic of Chile, is a country in western South America. It is the southernmost country in the world and the closest to Antarctica, stretching along a narrow strip of land between the Andes, Andes Mountains and the Pacific Ocean. Chile had a population of 17.5 million as of the latest census in 2017 and has a territorial area of , sharing borders with Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage to the south. The country also controls several Pacific islands, including Juan Fernández Islands, Juan Fernández, Isla Salas y Gómez, Desventuradas Islands, Desventuradas, and Easter Island, and claims about of Antarctica as the Chilean Antarctic Territory. The capital and largest city of Chile is Santiago, and the national language is Spanish language, Spanish. Conquest of Chile, Spain conquered and colonized the region in the mid-16th century, replacing Incas in Central Chile, Inca rule; however, they Arauco War ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chañarcillo
Chañarcillo is a town and mine in the Atacama Desert of Copiapó Province, Atacama Region, Chile, located near Vallenar and 60 km from Copiapó. It is noted for its silver mining. The town grew after the Chañarcillo silver mine, discovered on May 16, 1832, by Juan Godoy, sparked the Chilean silver rush. Villalobos, Sergio; Silva, Osvaldo; Silva Fernando and Estelle, Patricio. ''Historia de Chile''. Editorial Universitaria 1995. First Edition: 1974. p. 469-472. It grew in prominence in the second half of the nineteenth century and became important in the Atacama mining industry and one of the most important mines to the Chilean economy. It was connected by railway before 1862. Today the settlement is largely in ruins. The Chanarcillo District produced at least $100 million in silver before abandonment. This production from up to 20 mines was limited to a third of a square mile. From 1860 until 1885, 2,500,000 kg of silver was produced. Most production occurred before 1930. Fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chlorargyrite
Chlorargyrite is the mineral form of silver chloride (AgCl). Chlorargyrite occurs as a secondary mineral phase in the oxidation of silver mineral deposits. It crystallizes in the isometric–hexoctahedral crystal class. Typically massive to columnar in occurrence it also has been found as colorless to variably yellow cubic crystals. The color changes to brown or purple on exposure to light. It is quite soft with a Mohs hardness of 1 to 2 and dense with a specific gravity of 5.55. It is also known as cerargyrite and, when weathered by desert air, as horn silver. Bromian chlorargyrite (or embolite) is also common. Chlorargyrite is water-insoluble. It occurs associated with native silver, cerussite, iodargyrite, atacamite, malachite, jarosite and various iron–manganese oxides. It was first described in 1875 for occurrences in the Broken Hill district, New South Wales, Australia. The rich Bridal Chamber deposit at Lake Valley, Sierra County, New Mexico was almost pure chlorargyr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acanthite
Acanthite is a form of silver sulfide with the chemical formula Ag2S. It crystallizes in the monoclinic system and is the stable form of silver sulfide below . Argentite is the stable form above that temperature. As argentite cools below that temperature its cubic form is distorted to the monoclinic form of acanthite. Below 173 °C acanthite forms directly. Acanthite is the only stable form in normal air temperature. Occurrence Acanthite is a common silver mineral in moderately low-temperature hydrothermal veins and in zones of supergene enrichment. It occurs in association with native silver, pyrargyrite, proustite, polybasite, stephanite, aguilarite, galena, chalcopyrite, sphalerite, calcite and quartz. Acanthite was first described in 1855 for an occurrence in the Jáchymov (Joachimsthal) district, Ore Mountains, Bohemia (today Karlovy Vary Region, Czech Republic). The name is from the Greek "akantha" meaning thorn or arrow, in reference to its crystal shape. Gall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stephanite
Stephanite is a silver antimony sulfosalt mineral with formula: Ag5 Sb S4. It is composed of 68.8% silver, and sometimes is of importance as an ore of this metal. History Under the name Schwarzerz it was mentioned by Georgius Agricola in 1546, and it has been variously known as "black silver ore" (German ''Schwarzgultigerz''), brittle silver-ore (''Sprödglanzerz''), etc. The name stephanite was proposed by W Haidinger in 1845 in honour of the Archduke of Austria Stephan Franz Victor of Habsburg-Lorena (1817–1867). French authors use F. S. Beudant's name psaturose (from the Greek ''ψαθυρός'', fragile). Properties It frequently occurs as well-formed crystals, which are orthorhombic and occasionally show indications of hemimorphism: they have the form of six-sided prisms or flat tables terminated by large basal planes and often modified at the edges by numerous pyramid-planes. Twinning on the prism-planes is of frequent occurrence, giving rise to pseudo-hexagonal gro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
