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Heulandite occurs with stilbite and other zeolites in the amygdaloidal cavities of basaltic volcanic rocks, and occasionally in gneiss and metalliferous veins.

Stilbite, stil′bīt, n. a pearly and foliated variety of zeolite.

Magnificent groups of greenish and colourless tabular crystals, the crystals several inches across, were found, with flesh-red stilbite, in the Deccan traps of the Western Gh�ts, near Bombay, during the construction of the Great Indian Peninsular railway.

A family of simple minerals, including stilbite, mesotype, analcime, and some others, usually found in the trap or volcanic rocks.

Volcanic ash, or bole, is frequently found separating the different lava-flows; and in the upper amygdaloidal sheets numerous secondary minerals are found, such as quartz, agate and jasper, stilbite and chlorite.