heulandite


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Related to heulandite: natrolite, Thomsonite, stilbite

heulandite

[′hyü·lən‚dīt]
(mineralogy)
CaAl2Si6O16·5H2O A zeolite mineral that crystallizes in the monoclinic system; often occurs as foliated masses or in crystal form in cavities of decomposed basic igneous rocks.
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Structural classification Identified zeolitic phases Heulandite group (C4-C4-T1) stellerite, stilbite, stellerite-Na, Stilbite-Ca Chabazite group (C6) chabazite, levyne, chabazite-Ca, chabazite-Na Analcime group (C4-C4) analcime, wairakite, analcime-Mg Natrolite group (C4-T1) natrolite, thomsonite, thomsonite-Ca Phillipsite group (C4) phillipsite, phillipsite-Na Laumontite group (C8) laumontite
Heulandite was not found in this part of the mineralized zone.
such as heulandite in Zeolite (Ming and Mumpton 1989) and 2:1 layer aluminosilicates (Barbayiannis et al.
Because of the difficulty of discriminating accurately heulandite from clinoptilolite, we use the term "heulandite" to include both minerals.
Datolite and prehnite are still present; however, albite and calcite become more common, as do the zeolites heulandite and stilbite.
Heulandite is found commonly in the breccia cavities of the scoriaceous basalt.
If you have a hundred specimens of heulandite in your collection, unless you run a test on every single specimen you cannot reliably assign to them their correct modern names.
Calcite crystals typically cover first-generation crystals of heulandite, and are themselves covered by later mordenite.
Spence (1920) noted the presence of stilbite and heulandite in fluorapatite-phlogopite skarn deposits, and Hoffman (1901) reported faujasite from the Daisy mine, Papineau Co.
In February 1890 Niven received "one of the best lots of minerals from Nova Scotia I have ever seen, comprising chabazite, gmelinite, analcite, stilbite and heulandite," and also offered for sale an intriguing specimen: "the finest, largest and best rhodonite specimen that doubtless has ever been found," priced very high (for the times) at $500.
Pandey also had lustrous crystal groups of yet another new kind of basalt-cavity fluorapophyllite, these also from Aurangabad: lustrous, perfect tetragonal prisms with pyramid and basal faces are tinted deep green by included chlorite (not celadonite; the celadonite-included heulandite and stilbite crystals from India are paler green and much less lustrous).
Crystallized cavansite is found sporadically in the quarry floors, in small vugs and irregular cavities filled with heulandite and stilbite.