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312 SILICATES. nn r 71° 36' in 37° n' zz' 70 50 id 20 41 ii' 121 15 iz 28 31 lo 118 17 Xz 91 29 mn 74 50 iz 84 35 nz 29 18 zr 68 51 zd 38 15 zl 58 36 dm' 37 37 ni 59 16 ct 50 30 n\ 63 50 it 34 17 nt 68 39 EIG. 325. I r Fracture uneven... conchoidal. Opaque. Lustre vitreous; on m imperfect metallic. Black. Streak dark brown. n = 6'5. G = 4-115. Intumesces before the blowpipe, and melts into a bright, black, magnetic globule. With borax forms a green glass in the inner flame, and a glass which is orange -while hot in the outer flame. In salt of phosphorus leaves a skeleton of silica. Is found with diopside and chlorite in the Achmatowsk mine near the Kussinsk iron-works in the district of Slatoust in the Ural The form of hragationite agrees very closely with that of epidote. 175. ALLANITE.—Allanite, orthite ; Phillips. Cerium oxide siliceux noir; Ilauy. Tetartoprismatisches Melan-Erz, Prismatoidisches Melan-Erz ; Mobs. Allanit ; Hausmnnn. Allanit, Orthit, Cerin; Ilaidinger. Oblique. 101,100 = 63° 40'; 111,010 = 35° 45'; 101,001=51° 15'. m loo, t Oil, r 101, s 302, u 012, z Oil, n ill, d 111. Fracture conchoidal...uneven. Opaque. In thin splinters feebly translucent. Lustre imperfect metallic, inclining to vitreous or resinous. Black passing into brown or green. Brown by transmitted light. Streak greenish-grey...brownish- grey. Brittle. 11 = 6‘0. g = 3-1...42. TIG. 320, sm 34° 30 rm 63 40 tm 114 55 lit 35 7 Zt 54 35 till 109 47 ZZ 70 51 nri 71° 30' dd' 96 37 nt 68 33 td' 130 17 nm 74 59 zm 104 8 dm 127 40 r