391 Inlelligence and Miscellaneous Articles. 



current of air underground is uniform, and quite independent of ba- 

 rometrical or thermometrical changes. We shall at all times be ready 

 to give facilities to any parties you may wish to have an opportu- 

 nity of viewing the working of the machine. — Penrose and Evans, 

 Eaglesbush Colliery, Neath, March 5." — From theMining Journal for 

 March 20. 



ANALYSIS OF FAUJASITE. BY M. A. DAMOUR. 



The author states, that in a notice inserted in the first volume of 

 the fourth series of the Annales des Mines, he gave a description of 

 a mineral belonging to the zeolite family, which, on account of its 

 crystalline form and composition, appeared to him to constitute a 

 distinct species ; to this mineral he gave the name of Faujasite. The 

 rarity of the mineral at the time it was discovered prevented M. 

 Damour from employing more than a very small quantity for ana- 

 lysis. Having, however, lately procured several specimens, they 

 were employed in repeating the analysis. 



The fresh analysis gave as the composition of this mineral : — 



Silica 46-12 



Alumina 16*81 



Lime 4-79 



Soda 5-09 



Water 27*02 



99-83 

 In his first notice the author stated that faujasite retained its 

 transparency after heating to redness, and was acted upon by acids ; 

 he has since found that the mineral loses these properties when 

 heated to near its melting-point ; it then disengages the last traces 

 of water, becomes milk-white, and hydrochloric acid cold or boiling 

 does not act upon it. — Ann. des Mines, torn. xiv. p. &T. 



ANALYSIS OF CALIFORNIA GOLD. 



M. Rivot, mining engineer, has analysed a specimen of California 

 gold sent by Mr. Peabody to the Ecole des Mines. The specimen 

 contained — small flattened grains, of a fine yellow colour, and ex- 

 tremely small and smooth grains, attracted by the magnet, which 

 appeared to be titaniferous iron. A rather large, yellow and irre- 

 gularly rounded grain, weighing 0-628 grs., the density of which was 

 only 14-60, was fused on a small cupel in a muffle, and gave a but- 

 ton of alloy, the density of which was 17*48. 



The analysis of the grains of gold, performed on one gramme, 

 gave the following results : — 



Gold 90-70 



Silver 8-80 



Iron 0-38 



99-88--/6frf, 



