nickel-ochre. 523 The varieties with earthy fracture adhere to the tongue. Chemical Characters. It is infusible, without addition, before the blowpipe; with glass of borax it is reduced, and the glass acquires a hyacinth red colour; and it is insoluble in cold nitric acid. Constituent Parts. It is conjectured to be an Arsenate of Nickel. Geognoslic Situation. It occur* in veins in primitive and floetz rocks, along with. copper-nickel, and black nickel ore, and other ores. t Geographic Situation. It occurs at Leadhills and Wanlockhead ; at Alva in Stirlingshire, and in Linlithgowshire; at Andreasberg ia the Hartz; Iiiegelsdorf; in Saxony ; and at Allemont in Prance. N ORDER XVIII.