heulandite

Noun. (mineralogy) 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.

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This entry was last updated on RefTopia from its source on 3/20/2012.