WHITE VITRIOL, OR SULPHATE OF ZINC. 34d> Genus III.—Salts of Zinc. This Genus contains but one species, viz. White Vi triol or Sulphate of Zinc. • White Vitriol or Sulphate of Zinc. Vitriolum zinci, Waller. Syst. Min t ii. p. 24.—Zinc sulphat6e, Ilauij, t. iv. p. 180—Zink vitriol, Leonhard, Tabel. s. 45. Id. Karxlen, Tabel. s. 56—White Vitriol or Sulphate of Zinc, Kid, vol. ii. p. 24.—Zinkvitriol, JLens, b- ii. s. 996.—White Vitriol, Atkin, p. 250. External Characters. Its colours are greyish, yellowish, reddish, and green ish-white. It occurs massive, stalactitie, reniform, botryoidal, in trusts ; and crystallised in the following figures: 1. Rectangular four-sided prism, acuminated with four planes, which are set on the lateral planes. 2. Acicular crystals, which are promiscuously aggre gated. It is shining. The fracture is fibrous and radiated. It occurs in granular and prismatic concretions. It is translucent. It is soft, brittle, and easily frangible. Specific gravity, 2.00, B^rn. Its taste is nauseous metallic. Chemical Characters. It intumesces before the blowpipe, but does not phos phoresce : it dissolves in 2.285 parts of boiling water. Constituent