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From Armbruster + -ite, named after Swiss crystallographer Thomas Armbruster (born 1950).
Etymology from Wiktionary, CC BY-SA 4.0.
armbrusterite
Today it means: A mineral with the chemical formula K₅Na₃Mn³⁺Mn²⁺₁₄[Si₉O₂₂]₄(OH)₁₀·4H₂O. Full definition →