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510 HYDBOUS ARSEN1ATES AKE PHOSPHATES. 339. ETJCHEOITE. Euchroifce; Eufrenoy. Prismatischer bmaragd-Malachxt; Mobs. Euchroit; Hausmann, Haidinger. Prismatic. 011,010 = 30° 24' ; 101,001 =46° 4/ ; 110,100=68° 40'. ac me nc 71a nri c 001, n 101, m 110, S 90' 3 o' ma 68° 40' 90 0 mm' . 62 40 48 4 sa 47 36 43 56 ss' 84 48 92 8 IV 101 13 EIG. 508. a' Combinations, cnrnl, cnmsla. The faces m, s, I striated parallel to their intersections with each other; c, frequently convex. Cleavage. n,m, traces. Fracture uneven...conchoidal. transparent...translucent. Lustre vitreous. Emerald-green. Streak apple-green. Father brittle. h=3'5...4'0. g=3-35...3-46. In the matrass yields water, assumes a yellowish-green colour, and becomes friable. Ignited with charcoal powder in the matrass yields a sublimate of arsenic and arsenious acid. When heated to a certain point before the blowpipe on char coal it emits an arsenical smell, and is reduced in an instant with a kind of detonation. Soluble in nitric acid. Cu As + 7H, arsenic acid 34‘14, oxide of copper 47 - i5, water i8’7i. Analyses a by Turner, b, c by Kuhn, d by ‘Wohler:— Arsenic acid . . . Oxide of copper . . Lime Water Is found in attached crystals, in mica slate, at Libethen near Aeusohl in Hungary. a b c d 33-02 34-42 32-42 33-22 47-85 46-97 46-99 48-09 — — 1-12 — 18'80 1931 19-31 18-39 340. ERLNLTE. — Monotomer Dystom-Malachit; Mohs. Ennit; Hausmann, Haidinger. Traces of cleavage in one direction. Fracture imperfect conchmdal". uneven. Translucent on the edges. Lustre s !g y resinous, dull. Emerald-green, inclining to grass- Streak the same, approaching to apple-green. Brittle.