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Much Limonite, especially the fibrous type, is either Goethite or alter ed Goethite that absorbed water in its chemical structure. Limonite commonly forms as a pseudomorph over other minerals, especially Pyrite, Marcasite and Siderite.
A group of silicate minerals. May contain (very minor amount of) OH groups, considered as defects (e.g., Yang et al., 2015). In petrology the group is split into two major groups: <m>Alkali feldspar</m> - feldspar minerals rich in sodium or potassium. <m>Plagioclase</m> - the <m>albite</m> to <m>anorthite</m> series. Donate now to keep mindat.org alive!