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532 SULPHATES. Combinations, abc, abcm, abconf, abcmonf. b, rough; the other faces smooth. Cleavage, a, c, very perfect; b, less per fect, yet easily obtained. Fracture imperfect conchoidal. Transparent...translucent. Lustre vitreous, on the most per fect cleavages pearly. The optic axes are in a plane parallel to the face c, and make angles of 21° 46' with a normal to b. The indices of refraction of light in planes parallel to a, e, b, and polarized in those planes respectively, are l‘57l, 1'676, rei4. Colourless, white, inclining to grey, yellow, red, blue. Streak greyish-white. Brittle, h = 3-0...35. G = 2-85...3’05. Before the blowpipe melts with difficulty into a white enamel; on charcoal in the inner flame yields a hepar. With borax dissolves into a clear glass which is yellow when cold. With fluor melts easily into a clear bead. With soda forms a hepar. Is very slightly soluble in water and in hydrochloric acid. CaS, sulphuric acid 68 - 82, lime 41-18. Analyses of karstenite a from Sulz by Klaproth, b from Ililefeld, o, d from Yulpino by Stromeyer, e from Eisleben by Y. Rose:— a Sulphuric acid .... 6978 Lime 43-00 Red oxide of iron . . . o-io Silica o-25 Water — Carbon, acid and bitumen —■ W “ U TVAAAO OUl^UiUCO, IU1U iU l»UO ClUy WI11UI1 accompanies rock salt and gypsum. Is found at Aussee in Styria, Hall in the Tyrol, Hallein in Salzburg, Berchtesgaden, Ischel, at Bex and Val Canaria in Switzerland, Yic in Lorraine, Pesey in Savoy, Yulpino in Italy, Osterode and Eisleben, Segeberg, Liineberg, Tiede, Sulz, in the salt mines of Wieliczka and Bochnia, Lockport in New York. In veins with metallic sulphides at Riechelsdorf, Luu- terberg in the Harz, Kapnik, Bleiberg, Eahlun. 364. GLAUBERITE.— Glauberite; Phillips, Hauy. He- miprismatisches Brithyn-Salz; Mohs. Brongniartin; Ilaus- mann. Glauberit; Haidinger. Oblique. 101,100 = 37° 23'; 111,010 = 68° lo'; 101,001 = 30° 63'. a 100, c 001, t 20I, z 302, m 110, s ill, n ill, b 0 d e 66-80 66-78 68-01 66-28 40-67 41-61 41-70 41-48 025 0-03 — — 0-23 0-26 0-09 — 2-91 094 0-07 0-75 013 — — — 1 contorted masses; in beds