Greenalite is a mineral in the kaolinite-serpentine group with the chemical composition (Fe2+,Fe3+)2-3Si2O5OH4. It is a member of the serpentine group. ==Occurrence== Greenalite was first described in 1903 for an occurrence in the Mesabi Range near Biwabik, St. Louis County, Minnesota and named for its green color. Greenalite occurs as a primary p...
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http://en.wikipedia.org/wiki/Greenalite
(from the article `olivine`) ...metamorphosed iron-rich sediments. In the quaternary (i.e., four-component) system Fe2O3-FeO-SiO2-H2O, fayalite is associated with the minerals ... ...prevalent; these favoured the formation of minerals containing ferrous iron (reduced state of iron) from the alteration of basaltic rocks. Indeed, ... ....
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http://www.britannica.com/eb/a-z/g/68
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