(from the article `olivine`) ...In the quaternary (i.e., four-component) system Fe2O3-FeO-SiO2-H2O, fayalite is associated with the minerals greenalite (iron-serpentine), ...
Found on http://www.britannica.com/eb/a-z/m/97


Minnesotaite is an iron silicate mineral with formula: (Fe2+,Mg)3Si4O10(OH)2. It crystallizes in the triclinic crystal system and occurs as fine needles and platelets with other silicates. It is isostructural with the pyrophyllite-talc mineral group. ==Occurrence== Minnesotaite was first described in 1944 for occurrences in the banded iron formati...
Found on http://en.wikipedia.org/wiki/Minnesotaite
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