Tags: Chemical Substance, Mineral.

Cummingtonite is a metamorphic amphibole with the chemical composition (MgFe)7Si8O22(OH)2 magnesium iron silicate hydroxide.Monoclinic cummingtonite is compositionally similar and polymorphic with orthorhombic anthophyllite which is a much more common form of magnesium-rich amphibole the latter being metastable.Cummingtonite shares few compositional similarities with alkali amphiboles such as arfvedsonite glaucophane-riebeckite.

Amphibole_-_Cummingtonite_w-_chlorite_in_schist_Magnesium_iron_silicate_3800_foot_level_Homestake_Mine_Lawrence_COunty_South_Dakota_2071.jpg

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