Cummingtonite is a metamorphic amphibole with the chemical composition (Mg,FeČ)(Mg,FeČ)SiO(OH), 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. Wikipedia
-- Edited by Possum3 on Friday 10th of March 2023 11:46:50 PM
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