harmotome

noun

har·​mo·​tome

ˈhärməˌtōm

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

Word History

Etymology

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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