(Are you) Cummingtonite (back) T-Shirt
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fossiliferous on Zazzle Cummingtonite is a metamorphic amphibole with the chemical composition (Mg,Fe)7Si8O22(OH)2. It is commonly found in metamorphosed magnesium-rich rocks and occurs in amphibolites. It has also been found in some felsic igneous rocks such as dacites.
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