( 516 ) ORDER XVII.—NICKEL. i This Order contains four species, viz. Native Nickel* Copper-Nickel, Black Ore of Nickel, and Niekel-Ochre. I. Native Nickel. Gediegen Nickel, Klaproth. Gcdiegen Nickel, Klaproth, in d. Magaz. d. Berlin, Cesellscliaft Natf. Freunde, b. i. s. 307.; also his Beit. b. v. s. 231. Id• Karslen, Tabel. s. 72—Nickel natif, Ilamj, Tabl p. 84.— Gediegen Nickel, Ilaus. Handb. b. i. s. 117. Id. Leonhard, Taschenbuch fur 1815, s. 442. External Characters. Its colour is bronze yellow ; but is frequently tarnish ed greenish-grey, steel-grey, ash-grey, and lead grey, and occasionally invested with a delicate crust of brown iron stone. It occurs in capillary crystals, which are either promis cuously or scopiformly aggregated. Externally it is shining and splendent; but the tarnish ed parts are only feebly glimmering or dull. Internally it i s splendent and metallic. 1 he cross fracture is even, passing into very flat con- choidal. It is opaque. Its lustre is increased in the streak. It