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NEEDLE ZEOLITE. 303 Constituent Parts. Silica, - 50.24 Alumina, - 29.30 Lime, - Water, - I®' 00 99.00 Vauquclin, Jour, des Mines, N. 44. p. 576. G cognostic and Geographic Situations. Europe. It occurs in floetz-trap rocks, as in basalt, greenstone, and amygdaloid. In this country it occurs in Dunbartonshire, Ayrshire and Perthshire, and always in trap rocks. It is found in floetz-trap rocks in the Island of Iceland, and in the Faroe Islands; also in the rocks of the Puy de Marman in Auvergne; and m the Tyrol. ' America.—It occurs in floetz-trap rocks in the Island of Disco, in West Greenland. Observations. !• Crystallization, kind of lustre, fracture, distinct concretions, transparency, hardness, and weight, are the »»ost essential characters of this subspecies. ‘2. It is distinguished from Radiated Zeolite by its crystallization, vitreous lustre, prismatic distinct concre tions, greater transparency, hardness,'and brittleness : it is distinguished from Common Fibrous Zeolite by its more frequent and distinct crystallizations, its higher and n„me vitreous lustre, its prismatic distinct concretions, greater transparency, hardness, and brittleness. 50 20 8 22 100 Pelletier, Mem. de Chimie, Paris, 1798, t. i. p. 41. Third
