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Marcasite reacts more readily than pyrite under conditions of high humidity. The product of this disintegration is iron(II) sulfate and sulfuric acid. The hydrous iron sulfate forms a white powder consisting of the mineral melanterite, FeSO 4 ·7H 2 O. [13] This disintegration of marcasite in mineral collections is known as "pyrite decay".
Marcasite jewellery has been made since the time of the ancient Greeks. [3] It was particularly popular in the eighteenth century, the Victorian era and with Art Nouveau jewellery designers. [ 3 ] [ 2 ] When diamonds were banned from public display in Switzerland in the 18th century, marcasite, along with cut steel, was turned to as a replacement.
Marleka fairy stone from Stensö in Sweden. Iron sulfide concretions, such as the Kansas Pop rocks, consisting of either pyrite and marcasite, are nonmagnetic. [79] On the other hand, iron sulfide concretions, which either are composed of or contain either pyrrhotite or smythite, will be magnetic to varying degrees. [80]
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. [59]
Before the advent of steel, a variety of iron pyrite or marcasite was used with flint and other stones to produce a high-temperature spark that could be used to create fire. [4] There are indications that the Iceman, also known as Ötzi, may have used iron pyrite to make fire. [5]
Conway report in 2011 "Most marcasite jewelry today is actually faceted hematite." That may be true of high end merchandise that I never see. But there is also a thriving commercial trade in dark gray 'synthetic marcasite' for cheap jewelry, at prices like a few cents per small round stone, in lots of 1,000, which you can easily find on line.
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.
Pyrite and marcasite (FeS 2) are sulfide minerals and favor reducing conditions. They are the most common in fine-grained, dark colored mudstones. Hematite (Fe 2 O 3) is usually the pigment in red beds and requires oxidizing conditions.
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