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2021-5-8 Calaverite (gold telluride) Photo from WA Museum Gold most commonly occurs as a native metal, but will form compounds (or minerals) with tellurium, sulfur or selenium. The gold-bearing minerals that contain tellurium are called ‘tellurides’. The Golden Mile deposit in Kalgoorlie, Western Australia, is a massive deposit containing greater than 1500 tonnes of gold.
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To be an actual significant part of a non-alloyed mineral is really quite uncommon for gold and this makes calaverite a unique mineral indeed. For some reason gold has an affinity for the element tellurium, which is sometimes found naturally as native tellurium. Tellurium
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Calaverite, a gold telluride mineral (AuTe 2) that is a member of the krennerite group of sulfides and perhaps a structurally altered form (paramorph) of krennerite (q.v.); it generally contains some silver replacing gold.
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6 x 5 x 3.5 cm. Calaverite is a very rare crystallized gold telluride species, found in good crystals over 1mm in only a relatively few locations. The most classic old US locality for the species is from the silver and gold mines in Cripple Creek, Colorado (late 1800s and early 1900s). Most available specimens come from old collections and museum ...
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2016-9-12 gold-telluride ores could be classified into six mineral groups: calaverite (AuTe2), sylvanite [(Ag,Au)2Te4], mont-brayite [(AuSb)2Te3], krennerite [(Au1 x,Agx)Te2], petzite (Ag3AuTe2), and muthmannite [(Ag,Au)Te 2]. The physical properties and deposit location of these six minerals are tabulated in Table 1. Among them, Calaverite
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Calaverite or gold tellurideis an uncommon telluride of gold mineral with chemical formula (AuTe2). It was discovered in Calaveras County, California, in 1861 and named for the county. The color ranges between brass-yellow and silvery-white with green to yellow-green streak and metallic luster.
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2016-1-1 The main gold telluride, calaverite [AuTe 2], being of a brittle nature, mills very readily. The common use of hydrocyclones to classify the mill product leads to a preferential overgrinding of this high specific gravity (SG) material over the other ore components. This results in a much finer average telluride mineral particle size than the ...
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2020-5-16 Calaverite, or gold telluride, is an uncommon telluride of gold, a metallic mineral with the chemical formula AuTe 2, with approximately 3% of the gold replaced by silver. It was first discovered in Calaveras County, California in 1861, and was named for the county in 1868. The mineral often has a metallic luster, and its color may range from a silvery white to a brassy yellow. It is closely ...
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The six major gold-bearing tellurides are calaverite (AuTe2), sylvanite [ (Au, Ag)2Te4], montbrayite [ (AuSb)2Te3], krennerite [ (Au1-x, Agx)Te2], petzite (Ag3AuTe2) and muthmannite (AuAgTe2)....
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Calaverite, a gold telluride mineral (AuTe2) that is a member of the krennerite group of sulfides and perhaps a structurally altered form (paramorph) of krennerite (q.v.); it generally contains some silver replacing gold. Calaverite is most commonly found in veins that have formed at low
Read More2016-1-1 The main gold telluride, calaverite [AuTe 2], being of a brittle nature, mills very readily. The common use of hydrocyclones to classify the mill product leads to a preferential overgrinding of this high specific gravity (SG) material over the other ore components. This results in a much finer average telluride mineral particle size than the ...
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Calaverite is a gold telluride species, with the composition, AuTe 2. Calaverite is usually characterized by an exceedingly slow dissolution rate in a cyanide solution. Cyanidation of a slurry ...
Read More2020-5-16 Calaverite, or gold telluride, is an uncommon telluride of gold, a metallic mineral with the chemical formula AuTe 2, with approximately 3% of the gold replaced by silver. It was first discovered in Calaveras County, California in 1861, and was named for the county in 1868. The mineral often has a metallic luster, and its color may range from a silvery white to a brassy yellow. It is closely ...
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2021-1-15 Calaverite, or gold telluride, is an uncommon telluride of gold, a metallic mineral with the chemical formula AuTe2, with approximately 3% of the gold replaced by silver. It was first discovered in Calaveras County, California in 1861, and was named for the county in 1868.
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2009-12-15 Calaverite: AuTe2 (gold telluride) Brass yellow to silver white, metallic, brittle. Looks like pyrite, but when roasted, gold appears. Foothills gold belt, California; La Plata, Montezuma, Boulder, Hinsdale, and Teller Counties, Colorado, including the Cripple Creek District. Montbrayite: (Au,Sb)2Te3 to Au2Te3 (gold + antimony telluride) Tin ...
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2021-1-30 petzite (Silver Gold Telluride). Calaverite is closely related to sylvanite and differs only in silver content and slightly in hardness, cleavage, color and density. At times the two minerals are only distinguishable with chemical tests. Crystals of calaverite are unique and of interest to collectors.
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Calaverite 释义: a metallic pale yellow mineral consisting of a telluride of gold in the form of elongated... 意思、发音、翻译及示例
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ⓘ Engineer Gold Mine; Calaverite was reported by Cairnes (1911), who, without any data, surmised that Gwillim's (1900) "telluride", was "probably calaverite". There is no credible basis for the existence calaverite at the Engineer mine. Newfoundland and Labrador; Newfoundland; Burin Peninsula ⓘ
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2018-8-16 The gold‐telluride stage represents the main stage of gold precipitation. In gold‐polymetallic sulfide stage, Au formed within pyrite and As‐bearing pyrite in the form of invisible gold, whereas in the gold‐telluride stage, Au occurs as visible gold, such as native gold, electrum, calaverite, and petzite.
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Calaverite Calaverite, or gold telluride, is an uncommon telluride of gold, a metallic mineral with the chemical formula AuTe2, with approximately 3% of the gold replaced by silver. It was first discovered in Calaveras County, California in 1861, and was named for the
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Calaverite, or gold telluride, is an uncommon telluride of gold; it is a metallic mineral. It was first discovered in Calaveras County, California in 1861. Its chemical formula is AuTe 2. Its color may range from a silvery white to a brassy yellow. It is closely related to the gold - silver telluride sylvanite.
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2021-5-7 Calaverite, or gold telluride, is an uncommon telluride of gold, a metallic mineral with the chemical formula AuTe 2, with approximately 3% of the gold replaced by silver.It was first discovered in Calaveras County, California in 1861, and was named after the county in 1868. It was named after the place of its occurrence – Calaveras Co., California, USA.
Read More2020-5-16 Calaverite, or gold telluride, is an uncommon telluride of gold, a metallic mineral with the chemical formula AuTe 2, with approximately 3% of the gold replaced by silver. It was first discovered in Calaveras County, California in 1861, and was named for the county in 1868. The mineral often has a metallic luster, and its color may range from a silvery white to a brassy yellow. It is closely ...
Read More2016-1-1 The main gold telluride, calaverite [AuTe 2], being of a brittle nature, mills very readily. The common use of hydrocyclones to classify the mill product leads to a preferential overgrinding of this high specific gravity (SG) material over the other ore components. This results in a much finer average telluride mineral particle size than the ...
Read More2009-12-15 Calaverite: AuTe2 (gold telluride) Brass yellow to silver white, metallic, brittle. Looks like pyrite, but when roasted, gold appears. Foothills gold belt, California; La Plata, Montezuma, Boulder, Hinsdale, and Teller Counties, Colorado, including the Cripple Creek District. Montbrayite: (Au,Sb)2Te3 to Au2Te3 (gold + antimony telluride) Tin ...
Read More2021-1-30 petzite (Silver Gold Telluride). Calaverite is closely related to sylvanite and differs only in silver content and slightly in hardness, cleavage, color and density. At times the two minerals are only distinguishable with chemical tests. Crystals of calaverite are unique and of interest to collectors.
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Calaverite gives a good microchemical test for silver with potassium mercuric thiocyanate, but the reaction with potassium bichromate may be negative. It gives strong tests for gold with pyridine-HBr solution and for tellurium with cesium chloride. Coloradoite-HgTe Color, light pinkish gray; hardness C, appears sectile in small grains.
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2018-8-16 The gold‐telluride stage represents the main stage of gold precipitation. In gold‐polymetallic sulfide stage, Au formed within pyrite and As‐bearing pyrite in the form of invisible gold, whereas in the gold‐telluride stage, Au occurs as visible gold, such as native gold, electrum, calaverite, and petzite.
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