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PRISMATIC OLIVEN-ORE. Geographic Situation. It.lms been hitherto found only in Cornwall, where it is associated with the preceding subspecies, and many other ores of copper. 22. Oliven-Ore or Olive Copper-Ore. Olivenerz, Werner. This species is divided into four subspecies, viz. Pris matic Oliven-ore, Trihedral Oliven-ore, Fibrous Oliven- ore, and Earthy Oliven-ore. First Subspecies. Prismatic Oliven-Ore. Bliittriches Olivenerz, Werner. Arscniatc of Copper, in the form of an acute octahedron, Bour- non, Phil. Trans, part i. for 1801—Cuivre arscniatfe mguc, Brong. t. ii. p. 231—Dichtes Olivenerz, Karstcn, label. s. Gl. Cuivre arseniate octaedre aigue, llamj, Tab), r>. 91- Cuivre arseniate en prisme tetraedre rhomboidal, Bournon, Catalogue Mineralogiquc, p. 254—Gcmeincs Oliven Kupfer, llaus. Handbuch, b. ih. s. 1045—Prismatic Arseniate, Aihn, p. 32. * External Characters. Its colour is perfect olive-green, which passes on the one side into dark leek-grcen, and blackish-green ; on the other into pale leek-green, siskin-green, and sulphur-yel low. It seldom occurs massive, usually in drusy crusts; and in small crystals, which present the following varieties of form: 1. Rhomboidal