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This disintegration of marcasite in mineral collections is known as "pyrite decay". When a specimen goes through pyrite decay, the marcasite reacts with moisture and oxygen in the air, the sulfur oxidizing and combining with water to produce sulfuric acid that attacks other sulfide minerals and mineral labels. Low humidity (less than 60% ...
Pyrite and marcasite commonly occur as replacement pseudomorphs after fossils in black shale and other sedimentary rocks formed under reducing environmental conditions. [58] Pyrite is common as an accessory mineral in shale, where it is formed by precipitation from anoxic seawater, and coal beds often contain significant pyrite.
Marcasite brooch made from pyrite and silver. Marcasite jewellery is jewellery made using cut and polished pieces of pyrite (fool's gold) as gemstone, and not, as the name suggests, from marcasite. [1] Both pyrite and marcasite are chemically iron sulfide, but differ in their crystal structures, giving them different physical properties. Pyrite ...
Common goethite pseudomorphs include pyrite, siderite, and marcasite, though any iron(II)-bearing mineral could become a goethite pseudomorph if proper conditions are met. It may also be precipitated by groundwater or in other sedimentary conditions, or form as a primary mineral in hydrothermal deposits.
Grains of sediment, rock fragments and fossils can be replaced by other minerals (e.g. calcite, siderite, pyrite or marcasite) during diagenesis. Porosity usually decreases during diagenesis, except in rare cases such as dissolution of minerals and dolomitization.
Sulfide minerals such as pyrite (FeS 2) and pyrrhotite (Fe 1−x S) occur in many ore deposits. Pyrite and its polymorph marcasite also are important in many coal deposits and shales. These sulfide minerals form in environments more reducing than that of the Earth's surface.
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Pyrite FeS 2; Marcasite FeS 2; Molybdenite MoS 2; Sulfarsenides: Cobaltite (Co,Fe)AsS; Arsenopyrite FeAsS; Gersdorffite NiAsS; Sulfosalts: Pyrargyrite Ag 3 SbS 3; Proustite Ag 3 AsS 3; Tetrahedrite Cu 12 Sb 4 S 13; Tennantite Cu 12 As 4 S 13; Enargite Cu 3 AsS 4; Bournonite PbCuSbS 3; Jamesonite Pb 4 FeSb 6 S 14; Cylindrite Pb 3 Sn 4 FeSb 2 S 14
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