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PE ARL-S INTER. 225 Third Subspecies. Pearl-Sinter, or Fiorite. Fiorite, Thompson, Bibl. Britan, t.i. Janv. 1790.—Quartz-hya- lin concretionne, Ilauy, t. ii. p. 416.—Perlsinter, Molis, b. i. s> 247.—Quartz-hyalin concretionne, Brong. t. i. p. 274. Id. Lucas, p. 32. Id. Brard. p. 92- Id. Hauy, Tabl. p. 25.— Perlsinter, Steffens, b. i. s. 131. Id. Benz, b. i. s. 361. Id. Oken, b. i. s. 27#. External Characters. Its colours are milk-white, yellowish-white, greyish- white ; also pearl-grey ami yellowish-grey. It occurs coralloidal, stalactitic, tabular, cylindrical, fructicose, botryoidal, reniform, and small globular. Externally it is sometimes smooth and shining, with a pearly lustre, sometimes rough and dull: internally it is dull, glistening, or shining, with a lustre intermediate between resinous and pearly. The fracture is fine grained uneven; also flat conclioi- dal, and fine splintery. The fragments are angular, and not particularly sharp edged. It occurs in thin concentric lamellar distinct concre tions, which are curved in the direction of the external surface, and incrust massive pearl-sinter, which is in round granular distinct concretions. It is translucent, often only translucent on the edges; and sometimes is semi-transparent in thin pieces. It scratches glass, but is not so hard as quartz. Vol. I. P U