heulandite

Definitions of heulandite
  1. noun
    a group of minerals of the zeolite family consisting of a hydrous aluminum silicate of sodium and calcium
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    type of:
    zeolite
    any of a family of glassy minerals analogous to feldspar containing hydrated aluminum silicates of calcium or sodium or potassium; formed in cavities in lava flows and in plutonic rocks
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