HTDBOTJS AESE^IATES A'N'D PHOSPHATES. islands on the coast of Scotland, Crehowitz, Ivina, Holubkau in Bohemia, Frankenberg and Langenstriegis in Saxony, near Giessen, Darmstadt, Amberg, Kauniok in Greenland, Villa Rica in the Brazils, Roxborough in Pennsylvania. 35o. FISCHERITE.—Fischerite ; Dufrenoy. Fischerit: -Hausmann, Haidinger. . Transparent. Lustre vitreous. Light grass-green, passing into olive-green and verdigris-green. h = 5’0. a — 2'46. When heated yields water and becomes opaque. With borax and salt of phosphorus forms glasses which show the colour of iron while they are hot, and that of copper after cooling. With solution of cobalt becomes blue. But slightly acted upon by hydrochloric and nitric acids. Completely soluble in sulphuric acid. A1 P -f- 8H, phosphoric acid 29"0, alumina 41/7, water 29'3. Analysis by Hermann:— Phosphoric acid Alumina Oxide of copper Protoxides of iron and manganese Phosphate of lime and gangue . Water 29-03 38-47 080 1-20 3-00 27-60 Is found in small six-sided prisms, and in crystalline crusts, near Nischne-Tagilsk in the Ural. 356. TURQUOISE.—Calaite ; Phillips. Turquoise; Beu- dant. Untheilbarer Lasur-Spath; Mobs. Kallait; Hausmann. Tiirkis; Haidinger. Amorphous. Not cleavable. Fracture conchoidal... uneven. Faintly translucent on the edges... opaque. Lustre vitreous, feeble. Azure-blue...verdigris-green, sometimes pistachio or apple-green. Streak greenish-white. Not very brittle, ii = 60. G = 2-62...3-0. In the matrass yields water, decrepitates and grows black. Infusible before the blowpipe; the point of the flame is coloured green. With borax and salt of phosphorus forms a trans parent glass which shows the colour of iron while hot, and that of copper when cold. Soluble in hydrochloric acid. Analyses of turquoise a from .Tordansmiihle by John, b by Zellner, from Persia (blue) c, (green) d by Hermann:—