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celadonite

noun
cel·​a·​don·​ite | \ˈselədᵊnˌīt\
plural -s

Definition of celadonite 

: a soft green earthy mineral consisting of silicate of iron, magnesium, and potassium

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History and Etymology for celadonite

probably from German seladonit, from seladon celadon green (from French céladon) + -it -ite

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