220 FLINT GENUS. / Obfervations. 1. Hauy has formed of this fubfpecies two difth 1 ^ fpecies, but without fufficient reafon. 2. 1 he Jeuzitic cryftallization of cubic zeolite is confidered by Reufs and other mineralogifts as identi cal with leuzite. Independent of its different external chara&er, however, the cubic zeolite is geognoftically diflinguifhed from leuzite. Leuzite occurs in crys tals, which are all around cryflallized, or in grains, both of which are.imbedded, and confequently of co- temporaneous origin with the rock in which they arc found. r l he cubic zeolite, on the contrary, is found covering the walls of air cells in amygdaloid, there fore is of pofterior origin to the rock in which occurs. Geognostic Situation of Zeolite. In general it occurs in rocks belonging to the lat- eft formation, particularly in thofe of the neweft floetz trap, as amygdaloid, bafalt, wacce, porphyry flate, and greenflone. It is alfo, although rarely, found in primitive greenflone*. * * In the royal cabinet of minerals at Berlin I faw fpecim ens of primitive greenflone, from Sweden, containing zeolite. Occurs