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Noun
heulandite
Definition: a group of minerals of the zeolite family consisting of a hydrous aluminum silicate of sodium and calcium
Definition: A common mineral of the zeolite group with monoclinic crystals, the most usual form being heulandite-Ca (Ca,Na)₂₋₃Al₃(Al,Si)₂Si₁₃O₃₆·12H₂O.