Chabazite


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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.)

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Stilbite is abundant and chabazite is common in the area, with minor "heulandite" and barrerite.
Analcime and natrolite are abundant, mesolite and stilbite are common, and thomsonite, chabazite, laumontite, and "heulandite" are rare.
Chabazite shows a wide range of compositions from almost zero to 65% Ca+Mg.
Chabazite of the North Shore has a wide range of compositions, but within the range reported by Gottardi and Galli (1985).
In contrast, on the North Shore, all epistilbite, thomsonite, and mesolite analyses lie in this field, together with wairakite and many chabazite analyses, two minerals not analyzed from Kings County.
Chabazite was reported by Sabina (1965) from Mink Cove and Cape Split, but we have found no samples at Arlington Quarry and Morden (Pe-Piper 2000).
Barth-Wirshing and Holler (1989) suggested that chabazite forms from basaltic glass at temperatures of 50-150[degrees] C, whereas heulandite forms from rhyolitic glass at temperatures of 150-225[degrees]C.
The zeolite minerals identified on the North Shore of the Minas Basin include "heulandite", chabazite, gmelinite, analcime, wairakite, stilbite, barrerite, natrolite, scolecite, mesolite, thomsonite, laumontite, stellerite, tetranatrolite, and epistilbite.
At Wasson Bluff, celadonite, silica minerals, "heulandite", analcime, and chabazite in amygdales in the basalt flows and in basalt clasts in the McCoy Brook Formation formed before deposition of the McCoy Brook Formation sedimentary rocks began.