• WordNet 3.6
    • n heulandite a group of minerals of the zeolite family consisting of a hydrous aluminum silicate of sodium and calcium
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Webster's Revised Unabridged Dictionary
    • n Heulandite (Min) 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.
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Century Dictionary and Cyclopedia
    • n heulandite A mineral belonging to the zeolite group. It occurs in white to red or gray monoclinic crystals, with pearly luster on the surface of perfect cleavage. It is a hydrous silicate of aluminium and calcium.
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Chambers's Twentieth Century Dictionary
    • n Heulandite hū′lan-dīt a mineral of the zeolite group—from H. Heuland, an English mineralogist.
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Webster's Revised Unabridged Dictionary
After Heuland, an English mineralogist


In literature:

Heulandite is distinguished from stilbite by its crystals and perfect solubility; from apopholite by form of crystals.
"Scientific American Supplement, No. 344, August 5, 1882" by Various
Isomorphous with heulandite is the strontium and barium zeolite brewsterite, named after Sir David Brewster.
"Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4" by Various