- Sulfide also spelled:
- sulphide
- Related Topics:
- tungstenite
- aurostibite
- sulfarsenide
- stibiopalladinite
- algodonite
sulfide mineral
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What is a sulfide mineral?
A sulfide mineral is any compound of sulfur and one or more metals. Sulfides usually have a simple structure, high symmetry in their crystal forms, and metallic properties, including metallic luster and electrical conductivity. They often have striking colors, low hardness, and high specific gravity.
The composition of sulfide minerals can be expressed by the formula A_mS_n, where A is a metal, S is sulfur, and m and n are integers. The metals that occur most commonly in sulfides are iron, copper, nickel, lead, cobalt, silver, and zinc.
Sulfide minerals are the source of various precious metals, most notably gold, silver, and platinum. They are also the ore minerals of most metals used by industry, for example, antimony, bismuth, copper, lead, nickel, and zinc.
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What elements are commonly found in sulfide minerals?
Sulfide minerals are compounds of sulfur with one or more metals. Their composition follows the formula AmSn, where A is a metal, S is sulfur, and m and n are integers.
The most common metals found in sulfide minerals are iron, copper, nickel, lead, cobalt, silver, and zinc, though roughly fifteen other metals can enter sulfide structures. Examples of sulfide minerals include galena (lead sulfide, PbS), blende (zinc sulfide, ZnS), pyrite (iron disulfide, FeS2), and chalcopyrite (copper iron sulfide, CuFeS2).
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Where are sulfide minerals usually found in nature?
Sulfide minerals, compounds of sulfur with one or more metals, are found in various geological settings. They occur in all rock types but tend to concentrate in isolated pockets, forming mineral bodies like veins, fracture fillings, or replacements of pre-existing rocks.
These mineral deposits originate mainly from:
* The separation of an immiscible sulfide melt during the early stages of basic magmas crystallization.
* Deposition from aqueous brine solutions at temperatures between 300–600° C (572–1,112° F) and at relatively high pressure, such as at the seafloor or several kilometers beneath Earth’s surface.Sulfide minerals are sources of valuable metals like gold, silver, and platinum and serve as ore minerals for metals such as antimony, copper, lead, nickel, and zinc.
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How are sulfide minerals formed?
Sulfide minerals, compounds of sulfur with one or more metals, form through various geological processes under reducing conditions. These processes include separation of an immiscible sulfide melt during the early stages of basic magmas crystallization and deposition from aqueous brine solutions at temperatures in the 300–600° C range and at relatively high pressure, such as at the seafloor or several kilometers beneath Earth’s surface.
Hydrothermal solutions, especially sodium-calcium chloride brines, act as concentrating, transporting, and depositing agents for sulfide minerals. Volcanogenic massive sulfide (VMS) deposits, rich in copper, lead, and zinc, are formed when hydrothermal solutions cool rapidly and deposit their dissolved load on the seafloor. Additionally, supergene sulfide enrichment can upgrade buried sulfide deposits through the secondary deposition of metals dissolved as sulfates in percolating waters.
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What are some examples of important sulfide minerals?
Sulfide minerals are compounds of sulfur with one or more metals. They often have metallic properties, striking colors, low hardness, and high specific gravity.
Examples of important sulfide minerals:
* Galena Galena (PbS) is the most common sulfide with a sodium chloride structure and is the chief ore mineral of lead.
* Pyrite Pyrite (FeS₂) is a high-symmetry structure iron sulfide also known as fool's gold.
* Sphalerite Sphalerite (ZnS) is the chief ore of zinc.
* Chalcopyrite Chalcopyrite (Cu₂Fe₂S₄) is the most common copper mineral and an important copper ore.8 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
Why are sulfide minerals important in mining and industry?
Sulfide minerals are important in mining and industry as they serve as a source of various precious metals, including gold, silver, and platinum. They are also the primary ore minerals for many industrially utilized metals like antimony, bismuth, copper, lead, nickel, and zinc. Additionally, trace amounts of industrially significant metals like cadmium and selenium found in common sulfides can be recovered during refining processes. Sulfide minerals are frequently converted to oxides, sulfates, or chlorides.
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sulfide mineral, any member of a group of compounds of sulfur with one or more metals. Most of the sulfides are simple structurally, exhibit high symmetry in their crystal forms, and have many of the properties of metals, including metallic lustre and electrical conductivity. They often are strikingly coloured and have a low hardness and a high specific gravity.
The composition of the sulfide minerals can be expressed with the general chemical formula AmSn, in which A is a metal, S is sulfur, and m and n are integers, giving A2S, AS, A3S4 and AS2 stoichiometries. The metals that occur most commonly in sulfides are iron, copper, nickel, lead, cobalt, silver, and zinc, though about fifteen others enter sulfide structures.
Almost all sulfide minerals have structural arrangements that belong to six basic types, four of which are important. These arrangements are close-packing combinations of metal and sulfur, governed by ionic size and charge.
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The simplest and most symmetrical of the four important structural types is the sodium chloride structure, in which each ion occupies a position within an octahedron consisting of six oppositely charged neighbours. The most common sulfide crystalling in this manner is galena (PbS), the ore mineral of lead. A type of packing that involves two sulfide ions in each of the octahedral positions in the sodium chloride structure is the pyrite structure. This is a high-symmetry structure characteristic of the iron sulfide, pyrite (FeS2O). The second distinct structural type is that of sphalerite (ZnS), in which each metal ion is surrounded by six oppositely charged ions arranged tetrahedrally. The third significant structural type is that of fluorite, in which the metal cation is surrounded by eight anions; each anion, in turn, is surrounded by four metal cations. The reverse of this structure—the metal cation surrounded by four anions and each anion surrounded by eight metal cations—is called the antifluorite structure. It is the arrangement of some of the more valuable precious metal tellurides and selenides among which is hessite (Ag2Te), the ore mineral of silver.
In virtually all of the sulfides, bonding is covalent, but some have metallic properties. The covalent property of sulfur allows sulfur-sulfur bonds and the incorporation of S2 pairs in some sulfides such as pyrite. Several sulfides, including molybdenite (MoS2) and covellite (CuS), have layer structures. Several rare sulfide varieties have the spinel (q.v.) structure.
Phase relations of sulfides are particularly complex, and many solid state reactions occur at relatively low temperatures (100–300° C [212–572° F]), producing complex intergrowths. Particular emphasis has been placed on the experimental investigation of the iron-nickel-copper sulfides because they are by far the most common. They also are important geologic indicators for locating possible ore bodies and provide low-temperature reactions for geothermometry.
Sulfides occur in all rock types. Except for dissemination in certain sedimentary rocks, these minerals tend to occur in isolated concentrations which make up mineral bodies such as veins and fracture fillings or which comprise replacements of preexisting rocks in the shape of blankets. Sulfide mineral deposits originate in two principal processes, both of which have reducing conditions: (1) separation of an immiscible sulfide melt during the early stages of crystallization of basic magmas; and (2) deposition from aqueous brine solutions at temperatures in the 300–600° C (572–1,112° F) range and at relatively high pressure, such as at the seafloor or several kilometres beneath Earth’s surface. The sulfide deposits formed as a result of the first process include mainly pyrrhotites, pyrites, pentlandites, and chalcopyrites. Most others occur because of the latter process. Weathering may act to concentrate dispersed sulfides.
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Sulfide minerals are the source of various precious metals, most notably gold, silver, and platinum. They also are the ore minerals of most metals used by industry, as for example antimony, bismuth, copper, lead, nickel, and zinc. Other industrially important metals such as cadmium and selenium occur in trace amounts in numerous common sulfides and are recovered in refining processes.