Chabazite


Also found in: Dictionary, Thesaurus, Wikipedia.

chabazite

[′kab·ə‚zīt]
(mineralogy)
CaAl2Si4O12·6H2O A white to yellow or red member of the zeolite group occurring in glassy rhombohedral crystals; hardness is 4-5 on Mohs scale, and specific gravity is 2.08-2.16.

Chabazite

 

a mineral of the zeolite group, with the chemical composition (Ca, Na2, K2)Al2Si3–8O10–20(5.4–9.4)H2O and ad mixtures of Ba or Sr. Chabazite crystallizes in the trigonal system, forming rhombohedral crystals up to several centimeters in size. It also occurs in the form of crystalline aggregates and massive cryptocrystalline crusts. Chabazite is white or brownish, with a hardness of 4–5 on Mohs’ scale and a density of 2,080–2,160 kg/m3. It is formed in the pores and amygdules of effusive rocks and replaces volcanic tuff when acted upon by solutions of varied origin. It also occurs in hydrothermal veins and hot springs beds. Commercial deposits of chabazite are located in Bowie, Ariz. Structural analogues of chabazite have been synthesized. (See alsoZEOLITES.)

Mentioned in ?
References in periodicals archive ?
The chabazite group (secondary unit C6) was characterised by the presence of chabazite, levyne, chabazite-Ca and chabazite-Na.
Alteration of tuffitic strata exposed in a cliff above the village of Jedlka (SE of Decin) led to the origin of diagenetic analcime, phillipsite-Ca, and chabazite (Novak and Cilek, 2001).
They are "heulandite" (heulandite sensu stricto and clinoptilolite), chabazite, analcime, stilbite, barrerite, epistilbite, gmelinite, laumontite, natrolite, mesolite, scolecite, stellerite, tetranatrolite, thomsonite, and wairakite.
The only known specimen, found in a natrolite vein, shows 4 to 5-mm white prismatic crystals on chabazite.
Hexagonal crystals of graphite 1 mm in diameter occur included in and on the surfaces of calcite, pyrite, muscovite and chabazite.
Willimott (1884) reported chabazite and natrolite from the Haldane Mine and stilbite from the Moore (Seybold) Mine, Gatineau 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.
Other, less common mineral species that have been reported from the Klein Spitzkoppe occurrences include bixbyite, chabazite, columbite, euxenite-(Y), gibbsite, nacrite, opal (hyalite), pyrophyllite, talc, ferberite and zircon.
Examples of first-rate Scottish zeolites in the two cases included very large specimens of basalt plates and open tubes lined with lustrous white stilbite "bowties" to 5 cm, thick coverages of lustrous white and colorless chabazite rhombs to 3 cm on matrix, perfect glassy analcime trapezohedrons to 2.
Associated minerals are: microcline, aegirine, arfvedsonite, nepheline, eudialyte, albite, lorenzenite, loparite, aenigmatite, manganneptunite, murmanite, analcime, natrolite, stilbite, chabazite, kuzmenkoite-Mn, nontronite, and others.
Chabazite crystals from the deposit are white, translucent, and average several millimeters in size; they are commonly confused with dolomite.
Associated minerals are: muscovite, quartz, elbaite, topaz, milarite, calcite, chabazite, stilbite-stellerite, rutile, fluorite, pyrrhotite, sphalerite and pyrite.