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490 AESENIATES, PHOSPHATES. Cleavage, g, imperfect; a, c, traces. Fracture conchoidal. Transparent...translucent. Lustre vitreous. Wine-yellow... orange-yellow, inclining to grey. Streak white. Brittle, h = 6’0. ,.5'5. G = 2'98...3'13. . In . th in splinters melts with great difficulty before the blow pipe mto a dark greenish-grey glass. Moistened with sul- phunc acid it imparts a faint bLueish-green colour to the flame. Is soluble in powder in hot nitric or sulphuric acid with evolu tion of hydrofluoric acid. MgF + Mg 3 P, phosphoric acid 43'32, magnesia 37'o7, fluorine li 45, magnesium 7‘66. Part of the magnesia is re placed by lime and protoxide of iron. Analyses of wagnerite a by Fuchs corrected by Rammels- berg, b, c, d by Eammelsberg, e the result of d, the best of the analyses b, c, d, after excluding the silica:— Phosphoric acid Magnesia . . Lime . . . Protox. iron . Oxide of mangan Alumina . . Fluorine . . Silica . . . a b c d e 41-73 41-89 40'23 39-66 40-81 46-86 42-04 38-49 45-07 46-27 — 1-65 4’40 2-32 2-38 4-60 2-72 331 4-47 4'59 0-60 — — — 0-55 0-96 — 13-1 not det. 912 9-36 — — — 2-68 — mineral was found in crystals with Hiii.Lt. rocK, in rue vauey oi Hollengraben near Werfen in Salzburg. A crystal in Mr. Brooke’s collection shows all tho faces enumerated above, of which I, d, o, f appear to have been hitherto overlooked. 317. HERDERITE.—Herderite; Dufrenoy. Prismatisches Fluss-Haloid; Mohs. Herderit; Hausmann, Haidinger. Prismatic. 011,010=65° 6l'; 101,001=23° l'; 110,100=67° 56 ,- 6. a ioo, b oio cleavage, c ooi, t 302, * eoi, m 110, p in, n 331, o 441. The faces a, e truncate the edge lormed by t and the face parallel to t'; n. o truncate the edge pm ; b truncates the edge mm'.