WALCHOWITE. 629 Is found in large masses in the province of St. Juan de Berengela in South America. 470. RETINASPHALT.—Retinasphalt; Phillips, Beudant, Mohs. Retinit; Hausmann, Haidinger. Amorphous. Fracture conchoidal. Semi - transparent... opaque. Yellow, brown, grey. Streak yellowish-brown. Brittle. 11 = ro...2*o. g = 1*05...1*20. Acquires resinous electricity by friction. Burns with a flame, and emits a bituminous aromatic smell. Analyses of retinasphalt a from Bovey by Hatchett, I from Halle by Bucholz, c from Cape Sable by Troost, d from Bovey by Johnston:— a b c d Resin soluble in alcohol .... 65 91 55*5 59*32 Substance insoluble in alcohol . . 41 9 42*6 27*45 Earthy matter 3 — 1*5 1 13*23 It is probable that different substances are united under the name retinasphalt. Is found in brown coal near Halle, at Laubach in the Yogclsgebirge, Bovey in Devonshire, Cape Sable in Maryland, at Radnitz in Bohemia in stone coal, near Osnabriick in peat. 471. COPALINE.—Fossil copal; Phillips. Copale fossile ; Dufrenoy. Copalm ; Hausmann. Rotinit; Haidinger. Amorphous. Fracture conchoidal. Semi-transjiarent... trans lucent. Lustre waxy. Yellow, yellowish-brown, h = 2*5. o = 1*046. Brittle. When heated emits a resinous, aromatic smell. Melts into a clear fluid. Burns with a bright yellow flame and much smoke, leaving little or no residue. Very slightly soluble in alcohol and sether. Analyses of copaline a, b from Highgate by Johnstone, c from the East Indies by Duflos:— a b c Carbon 85*41 86*68 85*73 Hydrogen .... 11*79 n*48 11*50 Oxygen 2*67 2*84 2*77 Ash 0*13 — — Is found in blue clay at Highgate near London and in the East Indies. 472. WALCHOWITE. — Walchowit; Hausmann, Ilai- dinger. E e 3