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Ferrogedrite
Ferrogedrite is an amphibole mineral with the complex chemical formula of ☐Fe2+2(Fe2+3Al2)(Si6Al2)O22(OH)2. It is sodium and calcium poor, making it part of the magnesium-iron-manganese-lithium amphibole subgroup. Defined as less than 1.00 apfu (atoms per formula unit) of Na + Ca〔Leake, B. (2004) Nomenclature of amphiboles: Additions and revisions to the International Mineralogical Association’s amphibole nomenclature. American Mineralogist. 89. 883-887 ()
〕 and consisting of greater than 1.00 apfu of (Mg, Fe2+, Mn2+, Li) separating it from the calcic-sodic amphiboles.〔Deer, William Alexander, Robert Andrew Howie, and Jack Zussman. Rock-forming minerals. 2B. Double-chain silicates. Vol. 2. Geological Society, 1997.〕 It is related to anthophyllite amphibole and gedrite through coupled substitution of (Al, Fe3+) for (Mg, Fe2+, Mn) and Al for Si.〔 and determined by the content of silicon in the standard cell.〔
==Occurrence==
Specimens of ferrogedrite have been collected in the greenstone belt of Africa, in the mountains of Norway, Greenland, Japan and in amphibole specimens from northwest America as well as the southern coast of California.〔 Ferrogedrite exists in low temperature, high pressure contact metamorphic geologic settings〔 and remain stable up to 600 °C-800 °C due to its iron content.
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