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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".
English: Galena, Sphalerite, Marcasite Locality: Viburnum Trend District, Reynolds County, Missouri, USA (Locality at mindat.org) Cubes of galena to 1.5 cm on a matrix of sphalerite, with a ball of sparkly marcasite in one place. A classic Viburnum Trend combination - from the collection of Ed Ruggiero. 9.6 x 6.2 x 5.7cm
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At the time when the term became common in jewelry making, "marcasite" referred to all iron sulfides including pyrite, and not to the orthorhombic FeS 2 mineral marcasite which is lighter in color, brittle and chemically unstable, and thus not suitable for jewelry making. Marcasite jewelry does not actually contain the mineral marcasite. The ...
Other minerals that form concretions include iron oxides or hydroxides (such as goethite and hematite), [19] [20] dolomite, siderite, [21] ankerite, [22] marcasite, [23] barite, [24] [25] and gypsum. [26] Although concretions often consist of a single dominant mineral, [27] other minerals can be present depending on the environmental conditions ...
Frohbergite (German: Frohbergit, title by proper name: Max Hans Frohberg), also iron telluride is a rare hydrothermal mineral from the sulfide class, in composition — iron telluride with the ideal formula FeTe 2 (contains 82.05% tellurium and 17.95% iron).
Mineral symbols (text abbreviations) are used to abbreviate mineral groups, subgroups, and species, just as lettered symbols are used for the chemical elements. The first set of commonly used mineral symbols was published in 1983 and covered the common rock-forming minerals using 192 two- or three-lettered symbols. [ 1 ]
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 is more stable and less brittle than marcasite.
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