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OCTAHEDRITE. 3.5 5 6. Octahedrite. Octaedrit, Werntr. Schorl bleu, Romi de Lisle, t. ii. p. 406.—Schorl octaedre rect- angulaire, Bournon, Journ. de Phys. 1737, Mai.—Oisanite, Lam. t. ii. p. 269.—Octaedrite, Saussure, Voyages dans les Alpes, t. vii. p. 139. § 1901.—Anatase, ILauy, t. iii. p. 129. 136. Id. Broch. t. ii. p. 548. Id. Reuss, b. iv. s. 580.— Pyramiden Manak, Lud. b. ii. s. 191.—Anatase-titan, Suck. 2ter th. s. 480:—Anntas, Mohs, b. iii. s. 462. Id. Leonhard, Tabel. s. 82.—Titane-Anatase, Brong. t. ii. p. 101.—Anatas, Karsten, Tabel. s. 74. Id. Ilaus. s. 111.—Octahedral Ti- tamte, Kid, vol. ii. p. 223.—Titan anatase, Hauy, Tabl. p. 116 Anatas, Ilaus. Handb. b. i. s. 322.—Octohedrite, Aikin, p. 68. External Characters. Its colour passes from indigo-blue, through many ^adcs, to dark reddish-brown, clove-brown, and yellow- ish-brown. It has been hitherto found only crystallised, and the following are the figures which it assumes. 1. Lengthened octahedron *. 2. The preceding figure truncated on the extremi. ties f. 3. Octahedron acuminated on the extremities with four planes, and the acuminating planes set 011 the lateral planes J. Z 2 4. Octahedron, * Anatase priutitif, Ilttuy. 'I Anatase base, 11 auy. t r 4natns^ dioetnedrc, IIany.