harmotome

noun
har·​mo·​tome | \ˈhärməˌtōm\

Definition of harmotome 

: a mineral (Ba,K)(Al,Si)2Si6O16.6H2O consisting of a hydrous silicate of aluminum, barium, and potassium

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History and Etymology for harmotome

French, from Greek harmos joint + tomē section, from temnein to cut; from its occurrence in crystalline form with an octahedron dividing parallel to the plane that passes through the terminal edges

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