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Arsenic is an elusive element, with a mysterious ability to change color, behavior, reactivity, and toxicity. For exam-ple, two arsenic sulfide minerals, red-colored realgar (As 4S 4) and bright yellow orpiment (As 2S 3), were described by the ancient Greeks, but they considered them to be two entirely different substances (Irgolic 1992).
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The sulfides of Cd and Pb can be oxidized by sulfuric acid and oxygen and arsenic sulfide can be oxidized by oxygen over the temperature range of 0–100 C. On the basis of thermodynamic calculations, the data of standard Gibbs free energy (ΔG) and heat of reaction ΔH) for Equations (1)–(12) at the temperature of 60 C are shown in Table 2 .
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Several other, less-common minerals contain arsenic, including orpiment, realgar, and enargite, which are arsenic sulfides. Most arsenic is obtained not from an ore mineral of arsenic, but as a by-product in the treatment of gold, silver, copper, and other metal ores. Environmental laws require that arsenic be removed from ores, so that it does ...
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Oct 01, 2020 Not all minerals are considered equal. Some are considered downright toxic! Take time to consider before adding any of these to your collection. A prime example is arsenopyrite, or iron arsenide sulfide (FeAsS), sometimes called arsenical pyrite. This mineral is composed of 46% arsenic, which is a notorious poison.
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The Sulfide Class minerals comprise an economically important class of minerals. Most major ores of important metals such as copper, lead and silver are sulfides. Strong generalities exist in this class. The majority of sulfides are metallic, opaque, generally sectile, soft to average in hardness and they have high densities, black or dark-colored streaks, and an igneous origin.
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Interactive guide to hundreds of rocks and minerals. Some important minerals are not here yet. We are constantly working on expanding this list.
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Arsenic minerals exist in the environment principally as sulfides, oxides, and phosphates. In igneous rocks, only those of volcanic origin are implicated in high aqueous arsenic concentrations. Sedimentary rocks tend not to bear high arsenic loads, and common matrices such as sands and sandstones contain lower concentrations owing to the ...
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Arsenopyrite is an iron arsenic sulfide with a chemical composition of FeAsS. It is the most abundant arsenic-bearing mineral and the primary ore of arsenic metal. It is associated with other sulfide minerals in organic-rich sedimentary rocks, metamorphic …
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arsenic content of the sediments that indicates that the copper and zinc occur as sulphide minerals. The mean concentrations of arsenic in the groundwater are 1.1793 μg/L. The concentration of all the water samples is below the permissible limit of ... (Sakala et al. 2011). Insoluble arsenic sulphides are oxidized through the As-bearing rock ...
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Sep 17, 2014 Orpiment is a deep orange-yellow colored arsenic sulfide mineral. Chemical formula As2S3.Often found with realgar and stibnite. Arsenopyrite had no effect on gold dissolution at pH realgar had no adverse effect on gold dissolution at pH 10 or 11 but at pH 12 the retarding effect was significant.
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Realgar is a monoclinic arsenic sulfide mineral with a brilliant red color and a chemical composition of As 4 S 4. Well-formed realgar crystals can look so much like red gemstones that the mineral was often called ruby sulfur and ruby arsenic. However, realgar is not used as a gemstone because it is very soft, with a Mohs hardness of just 1-1/2 to 2. It is easily ground into a fine, bright red powder.
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Nov 01, 2014 Arsenic sulphide mineralogy in copper deposits has been reviewed by Long et al. (2012). A range of arsenic minerals including arsenopyrite, tetrahedrite, tennantite and enargite occur in various copper deposits in the world. Rejection of arsenic minerals in sulphide flotation has been reviewed by Ma and Bruckard, 2009, Plackowski et al., 2012. In general, pre-oxidation of flotation pulp …
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Sep 30, 2015 Tennantite and enargite as well as Freibergite are copper arsenic sulphide minerals that respond to flotation in a similar manner to other copper sulphides. As such, depression of these minerals would tend to result in depression of other copper sulphides.