| heulandite | <chemical> A mineral of the Zeolite family, often occurring in amygdaloid, in foliated masses, and also in monoclinic crystals with pearly luster on the cleavage face. It is a hydrous silicate of alumina and lime. Origin: After Heuland, an English mineralogist. Source: Websters Dictionary (01 Mar 1998) |
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| heulandite | a group of minerals of the zeolite family consisting of a hydrous aluminum silicate of sodium and calcium |
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