gmelinite


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gmelinite

[gə′mel·ə‚nīt]
(mineralogy)
(Na2Ca)Al2Si4O12·6H2O Zeolite mineral that is colorless or lightly colored and crystallizes in the hexagonal system.
References in periodicals archive ?
As potassium-bearing zeolite (phillipsite) is present, the origin of pure gmelinite is improbable.
and Rychly, R.: 1979, Gmelinite from the locality of Dobranka near Decin, Cas.
They are "heulandite" (heulandite sensu stricto and clinoptilolite), chabazite, analcime, stilbite, barrerite, epistilbite, gmelinite, laumontite, natrolite, mesolite, scolecite, stellerite, tetranatrolite, thomsonite, and wairakite.
Gmelinite is generally pink and vitreous with well formed colourless hexagonal dipyramid, prism and pinacoid crystals (Fig.
Gmelinite is a rare zeolite found only as crystals on datolite, in the basal zone of the lower amygdaloid.
Gmelinite occurs very rarely in cavities in the upper sill in the alcove as colorless, tabular crystals to 3 mm, associated with quartz and dolomite (A.
C C C Gismondine ER ER Glauconite series ER ER Gmelinite series ER ER Goethite R C Graphite ER ER?
Name: For the relationship to the other members of the gmelinite series.
Gmelinite ([Na.sub.2], Ca)[Al.sub.2][Si.sub.4][O.sub.12] [multiplied by] 6[H.sub.2]O
Gmelinite is extremely rare in the miarolitic cavities as attractive "bow-tie" clusters of 0.8-1 mm long, colorless to white, slightly tapering hexagonal {1010} prisms terminated by the {0001} basal pinacoid.
On a recent trip to Sardinia, Claude Begin (749 Union St., Laval, Quebec H7X 1X7) obtained some very fine gmelinite crystals associated with natrolite from Ittiri, Sassari, and some world-class specimens of ferrierite from near Monastir, Cagliari.
Finally, even the humble zeolites shine in Kazakhstan: there are plentiful, very pretty miniature-to-cabinet-sized specimens of gmelinite, with flesh-colored rhombohedrons to 1 cm on dark matrix, as well as yellow-orange, shiny stilbite balls and sheaves, from Sokolovskaya.