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2. Marcasite - Wikipedia

   en.wikipedia.org/wiki/Marcasite

   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".

3. Pyrite - Wikipedia

   en.wikipedia.org/wiki/Pyrite

   Building stone containing pyrite tends to stain brown as pyrite oxidizes. This problem appears to be significantly worse if any marcasite is present. [ 50 ] The presence of pyrite in the aggregate used to make concrete can lead to severe deterioration as pyrite oxidizes. [ 51 ]

4. Marcasite jewellery - Wikipedia

   en.wikipedia.org/wiki/Marcasite_jewellery

   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 ...

5. Mineral - Wikipedia

   en.wikipedia.org/wiki/Mineral

   For example, pyrite and marcasite, both iron sulfides, have the formula FeS 2; however, the former is isometric while the latter is orthorhombic. This polymorphism extends to other sulfides with the generic AX 2 formula; these two groups are collectively known as the pyrite and marcasite groups. [62] Polymorphism can extend beyond pure symmetry ...

6. Goethite - Wikipedia

   en.wikipedia.org/wiki/Goethite

   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.

7. Concretion - Wikipedia

   en.wikipedia.org/wiki/Concretion

   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]