154 GLACE DE MARIE. 



The faces of the crystals never have the 

 strias of those of Phillipsite, and the mam- 

 millated specimens are not columnar within : 

 moreover, Phillipsite does not lose any of 

 its water below 100° C. (212° Fah.)- 



Name. After Charles-Joseph Gismondi, 

 Professor of Mineralog}"^ at Rome. 



Brit. Mus., Case 29. 



Glace de Marie. Selenite. See Pierre 

 A Jesus. 



Glance -Blende, Mohs. See Mangan- 

 blende. 



Glance Coal, Jameson. See Anthra- 

 cite, 



Glance Cobalt, Jameson. See Cobal- 



TINE. 



Glance Copper. See Copper Glance. 



Glanz, Haidinger. See Galena. 



Glanzarsenikkies. See Leucopyrite. 



Glanz braunstein, Hausmann. See Haus- 

 mannite. 



Glanzkobalt; Glanzkobold, Werner. 

 See Cobaltine. 



Glanzkohle, TFenner. See Anthra- 

 cite. 



GLiASERiTB, Hausmann. Rhombic. Occurs 

 in thin tables and in blades made up of 

 aggregated crystals ; also massive, or im- 

 perfectly mam miliary, apparently formed 

 in successive layers, and in crusts. Colour 

 v/hite or yellow, sometimes with a bluish or 

 greenish stain. Lustre vitreous, inclining 

 to resinous. Transparent to translucent or 

 opaque. Taste saline and bitter. Cleavage 

 and fracture indistinct. 



Fig. 210. 



Camp. Sulphate of potash or K S = pot- 

 ash 54-1, sulphuric acid 45-9 = 100. 

 Analysis, from Vesuvius: 



Sulphate of potash . .71-4 



Sulphate of soda . . . 18 6 

 Chloride of sodium . . 4-6 

 Chloride of ammonium, cop- 

 per and iron . . .5-4 



100-0 

 BB fuses without intumescence. 

 Localities. In delicate white crvstalliza- 

 tions, and in m.asses, often an inch or more in 

 thickness, sublimed on lava round the fuma- 

 roles of Vesuvius and other volcanoes. 



" GLAUBERITE. 



Glaserz, Hausmann, Werner. Silver 

 glass. See Silver Glance. 



Glass-schorl or Glastein, Wiedenman. 

 See AxiNiTE. 



Glassy Felspar. See Sanidine. 



Glassy Quartz, Kirwan. See Greasy 

 Quartz. 



Glatte. See Plumbic Ochre. 



Glauber-salt, Kirwan; Glaubersalz, 

 Wei^ner. Obnque : primary form an oblique 

 rhombic prism. Usually occurs in efflo- 

 rescent crusts and in an earthy form, of a 

 grej'ish or yellowish-white colour. Lustre 

 vitreous on fresh fractures, dull at the sur- 

 face. Translucent or opaque. Extremely 

 efflorescent, falling spontaneously into 

 powder. Brittle ; easily frangible. Has a 

 cooling, and then a bitter, saline taste. H. 

 1-5 to 2. S.G. 1-48. 



Comp. Sulphate of soda, or Xa S + 10 H 

 = soda 19-3, sulphuric acid 24-8, water 55-9 

 = 100. 



Analysis, from Nova Scotia, by H. Haw : 

 Sulphate of soda . . . 44-54 

 Water .... 65-46 



100-00 



In the matrass melts in its water of com- 

 position. 



BB behaves like Epsomite, but its solu- 

 tion does not afford a precipitate with lime- 

 water. 



Localities. Eger, and in the hot springs 

 of Carlsbad and Seidlitz, in Bohemia. Old 

 salt mines at Ischl and Hallstadt, in Upper 

 Austria. Altenberg, in Styria. Hungary. 

 Switzerland. Italy. Near Aranjuez, in 

 Spain ; and in enormous quantities near 

 Lodoso, on the borders of Navarre and 

 Old Castile ; also in the mountains at San- 

 tander, and Alcanadra. Egypt. On the 

 banks of many Siberian salt lakes. A 

 cavern on Hawaii, one of the Sandwich 

 Islands. With Hayesine in cavities in the 

 Gypsum of Nova Scotia, &c. 



Name. After Glauber, a German chemist, 

 who first discovered the artificial salt. 



When purified, Glauber Salt is used as a 

 purgative medicine. 



Glauberite, Brongniart, Haily, Jameson, 

 Phillips. Oblique : primary form an oblique 

 rhombic prism. Occurs crystallized in the 

 form of oblique and extremely flat rhombic 

 prisms, of a pale yellow or grey colour. 

 Lustre vitreous. Translucent, rarely trans- 

 parent. Streak white. Brittle. Fracture eon- 

 choidal. Taste slightly saline. When im- 

 mersed in water becomes opaque, and is 



