BOTBTOGETT. 551 Is found in the mines near Goslar, Fahlun, Herrengrund, Sehemnitz, Kremnitz, Schmolnitz, Hiiring and Sterzing. FeS + 7H and CoS + 711 are isomorphous with crystals of Mns + 7ii obtained from a solution of sulphate of protoxide of manganese below 6° c. A mixture of nearly equal parts of sul phate of protoxide of iron and sulphate of oxide of copper, or of sulphate of oxide of nickel and sulphate of oxide of copper, crystallizes with seven proportionals of water, in forms iso morphous with melanterite. 384. BOTRYOGEN.—Eer sulfate rouge; Dufrenoy. ITe- miprismatisches Botryogen-Salz; Mohs. Botryogen ; Haus- mann, Haidinger. Oblique. 101,100 = 63° 5'; 111,010 = 62° 4l'; 101,001 = 54° 29'. I 010, c 001, V 023, X 101, m be 90° O' r 81° 44' xb 90 0 nb 62 41 vb 70 30 nx 27 19 VC 19 30 nr! 126 22 vv 141 0 me 113 37 xe 64 29 cm! 66 23 mb 69 68 nc 68 66 mm' 119 60 mbc 117 34 fb 40 62 FIG. 545. S' > m' f b / m Combinations, cvmf cvnxmfb. Cleavage, m, tolerably perfect; f traces. Fracture conchoidal. Translucent. Lustre vitreous, llyacinth-rcd...ochre-yellow. Streak ochre-yellow. Sectile. n = 2-0...2-5. g = 2-030. Taste slightly astringent. In tho matrass yields water. Before the blowpipe becomes red in the outer flame, and black in the inner flame. Imparts the colour of iron to fluxes. Partially soluble in boiling water, leaving a yellow residue. Analyses by Berzelius:— Sulphato of protoxide of iron . Sulphate of oxide of iron (f ¥ s) Sulphate of magnesia . . . Sulphate of lime Water and loss In crystals and massive. It appears to bo a product of the decomposition of pyrite, along with which it is found at Fahlun in Sweden. It is said to have been found also on Vesuvius. 0-77 6-86 I 48-3 3586 39 92 J 26-88 17-10 20-8 222 6-71 — 28-28 3142 309
