Also found in: Thesaurus, Encyclopedia, Wikipedia.
Related to heulandite: natrolite, Thomsonite, stilbite


A white, red, or yellow zeolite mineral, CaO·Al2O3·6SiO2·5H2O.

[After Henry Heuland, 19th-century British mineralogist.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Minerals) a white, grey, red, or brown zeolite mineral that consists essentially of hydrated calcium aluminium silicate in the form of elongated tabular crystals. Formula: CaAl2Si7O18.6H2O
[C19: named after H. Heuland, 19th-century English mineral collector; see -ite1]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈhyu lənˌdaɪt)

a usu. white or transparent zeolite, hydrous calcium-sodium aluminum silicate, occurring as crystals in basic volcanic rocks.
[1815–25; after Henry Heuland, English mineralogist]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.heulandite - a group of minerals of the zeolite family consisting of a hydrous aluminum silicate of sodium and calcium
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Mentioned in ?
References in periodicals archive ?
Zeolites are microporous aluminosilicate minerals such as analcime, chabazite, clinoptilolite, heulandite, natrolite, phillipsite, and stilbite.
There are many species of zeolites, such as Analcime, Chabazite, Clinoptilolite, Faujasite, Ferrierite, Heulandite, Laumontite, Mordenite.
Heulandite or calcite replaces the schist fragments.
Clinoptilolite (CP), the most abundant zeolite in nature, isostructural with heulandite, is employed as sample zeolite in this study.
Geological Survey has reported natural zeolites' worldwide occurrence in the USA, Japan, Korea, Bulgaria, Czechoslovakia, Romania, Hungary, Russia, Yugoslavia, South Africa, Italy, Germany, Turkey and China, the latter having the greatest worldwide production Clinoptilolite, mordenite, heulandite, chabazite, phillipsite and laumontite are some of the more than 40 known natural zeolites occurring in reasonably high quantities and purity.
A basalt quarry near the town of Sambava is the site of Madagascar's first known occurrence of calcite, stilbite, laumontite and heulandite in fine specimens.
For example, Zeolite was dominated by heulandite, with lesser amounts of quartz and smectite.
The dominant vesicle fillings in basalt are celadonite and silica minerals, with minor "heulandite", chabazite, and analcime.
Although not a major producer of collector-quality specimens, it has yielded fine examples of heulandite, stilbite, calcite, chalcedony, datolite and prehnite.
The deep-sea volcanogenic accumulations interlayered with basalt effusives contain the following secondary silicates in semiquantitative relations: saponite > analcime, wairakite > chlorite, actinolite, tremolite > heulandite, clinoptilolite (?), and talc (?).
Compound Chemical formula Heulandite Ca([Si.sub.7][Al.sub.2])[O.sub.18] x 6[H.sub.2]O Sanidine Kal[Si.sub.3][O.sub.8] TABLE 2: Measurements of surface area of zeolite without and with amorphous Si[O.sub.2(NPs)].