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( 270 ) VII. PITCIISTONE FAMILY. This Family contains the following Specie3: Obsidian, Pitehstone, Pearlstone, and Pumice. 1. Obsidian. This Species is divided into two subspecies, viz. Trans lucent Obsidian and Transparent Obsidian. First Subspecies. Translucent Obsidian. Durchscheinender Obsidian, Hoffmann. Aohates islandicus, Wtill. t. ii. p. 378.—Pumex vitreus solidus, Syst. Nat. xii. 3. p. 182. n. 7-—Verre de volcan en masses ir- reguliers, Pierre obsidienne, Pierre de gallinnce, & Agathe noir d’lslaude, Rome de Lisle, t. ii. p. 635.—Verre ou I.aiticr de volenn, Faujas, des Voleans, p. 308.—Obsidian, JVid. s. 348- Id. Kirwan, vol. i. p. 265.—Obsidiano, Nap. p. 205.—Lave vitreuse obsidienne, Hany, t. iv. p. 494—Obsidian, Ileuss, b. ii. s. 355. Id. Lud. b. i. s. 85. Id. Stick, lr th. s. 371 ■ Id. Bert. s. 270. Id. Mohs, b. i. s. 349. Id. Hab. s. 15.— Lave vitreuse obsidienne, Lucas, p. 231.—Obsidienne, Bronf- t. i. p. 3o5—Lava verre noire, Brard, p. 447-—Obsidian gemeiner, Leonhard, Tabcl. s. 14 Obsidian, Karsten, Tabcl. s. 36.—Obsidian, Kid, Appendix, p. 38. Id. Steffens, b. i- s. 371-—Durch.scheinender Obsidian, Iloff'. b. ii. s. I.91-—' Oemeiner Obsidian, Lenz, b. i. s. 432 Obsidian, or Lava- glass, Okeu, b. i. s. 305. External Characters. Its most frequent colour is velvet-black, which sonic* time*