euhedral crystals, pyramidal, tabular, or rhombohedral,
striated || (0001) or less commonly, || ,
to 4 cm. Rarely in radiating aggregates or granular.
is one of the rarest of the Zeolite
Group of minerals that includes
over 40 minerals and these gem-type minerals: Analcime,
Thomsonite and Yugawaralite.
Most of these minerals are typically
found only as very fine, radiating needles, cottony
aggregates or radiating masses so gem quality crystals
are somewhat rare. Gmelinite
crystals however, are hexagonal in outline and
dipyramid (two identical pyramids at the top and bottom).
in small amounts. A few localities for well studied
material follow. From Montecchio Maggiore, Vicenza,
Italy. At Glenarm and elsewhere in County, Antrim,
Ireland. On the Isle of Skye, Scotland. At Pyrgos, Cyprus.
Pinnacle Rock, Five Islands, and Two Islands, Nova Scotia,
Canada. In the Il¶³maussaq intrusion, southern Greenland.
At Sarbay-Sokolov, Kazakhstan. Large crystals from Bekiady,
Madagascar. From around Flinders, Victoria, Australia.
In the USA, from Bergen Hill, Hudson County, and Great
Notch, Paterson, and Prospect Park, Passaic County, New
Jersey; at Springfield, Lane County, Oregon.