FIBROUS OLIVEN-ORE. 191 Third Subspecies. Fibrous Oliven-Cre. Fasriges Olivenerz, Werner. . Haematitiform and Amianthiform Arseniate, Bournon, Phil. Trans, for 1801.—Cuivre arseniate capillaiie et mamelonne, Brong. t. ii. p. 231, 232.—Fasriges Olivenerz, Karsten, Tabel. s. Cl'.—Cuivre arseniate mamelonne libreux, Hauy, Tabl. p. 91.—Cuivre arseniate en petites masses babituelle- ment fibreuses et mamelonnees, Bournon, Catalogue Mme- ralogique, p. 259.—Fasriges Oliven Kupfer, IIaus. Handbueh, iii. s. 1047-—Haeinatitic and Amianthiform Arseniate, Aihin, p. 83. External Characters. Its colour is olive-green of different degrees of inten sity. The darker varieties border on blackish-green, the lighter pass into pistachio-green, liver-brown, wood- brown, and greenish-white. The colours are sometimes arranged in spotted and striped delineations. % Tt occurs massive, reniform, and crystallised in capil lary crystals. The crystals are small and very small, and externally shining. Internally the massive varieties are glistening or glim mering, with an adamantine lustre. The fracture is delicate and scopiform fibrous. The fragments are indeterminate angular, and wedge- shaped. It