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SCOltODITE. 499 In the matrass yields water and becomes red. Before the blowpipe on charcoal emits fumes of arsenic and melts into a magnetic bead, which imparts the colour of iron to glass of borax. Soluble in hydrochloric acid. Is decomposed by potash, leaving a residue of red oxide of iron. in 3 As 2 + 12H, arsenic acid 39’78, red oxide of iron 41'63, water 18'69. Analysis by Berzelius :— Arsenic acid 40'20 Phosphoric acid 2'53 Bed oxide of iron 37‘82 Oxide of copper o - 65 Water 18'61 Earthy matter 1'76 It is found in small attached crystals, and granular masses, in the veins of copper ores in the mines of Huel Gorland, Huel Unity and Carharack in Cornwall, St. Leonard near Li moges in France, llorhausen in Nassau, Langeborn in Spes- sart, Lobenstein in Beuss, Graul near Schwarzenberg in Saxony, in many parts of the United States. 328. SCOBODITE.—Martial Arseniate of copper ; Phillips. Scorodite; Beudant. Peritomes Fluss-Haloid; Mohs. Sko- rodit; Ilausmann, Ilaidinger. Prismatic. 011,010=42° 20'; 101,001=43° 38 ,- 6; 110,100=49° l'. « 100, b 010, 0 001, n 021, m 110, d 210, r ill, s 112. n truncates the edge be. be 00° 0' rr' ca 90 0 rr" ab 90 0 r'r" nb 24 30 rrn ma 49 1 ss' ml 40 69 ss" mm 81 68 s's" dd 120 10 sm Combinations, cr, crnda, crndab, rndab. Cleavage, d, im perfect; a, b, traces. Fracture uneven. Semi-transparent... translucent on the edges. Lustre vitreous, inclining to ada- mantino on the faces; surface of fracture inclining to resinous. Green and blue of various Bhades, liver-brown. Dichromatic. Streak white. Bather brittle. u = 3 - 5...4 0. g = 3-i8...3'30. 78 65 110 68 34 31 45 22 62 42 72 2 63 59