Mineralogy and Geology. 



275 







semi-steatitic kyanite at Crowder's mountain in North Carolina ; from 

 which region I also possess large masses of deep blue lazulite associa- 

 ted in some instances with topaz ; the latter in distinct crystals. 



Brookite occurs in the gold washings of Rutherford county, N. C. 

 Mr. Clingman has supplied me with nearly one hundred crystals, among 



The angles appended are only 



which I find the following new forms, 

 approximations. 



P on o 116° 20'. P on x (a plane 

 on the edge P : I) 151°. P on M 90°. 

 M on M 100° 45'. M on I 140° 30'. 



1. 



p 



o on o 

 o on x 140° ? 



126° ? 

 a on a 



M 



I 



M 



^ 



17 



M on o 151° 40'. 



o on o> 78° 0'. 

 137° 30' ? 



Monazite. — Crystals of this sub- 

 stance are also abundant in the same 

 situations. They closely resemble the 

 same species from the Urals. 



Wauellite. — This mineral has been sent to me by Dr. Pendleton of 

 Athens, Ga. It occurs on a jaspery opal in Washington county near 

 Saundersville, Georgia. 



Babingtonite at Athol, Mass. This mineral has been brought to light 

 in the railroad excavations in this town during the past year, in very 

 splendid crystals, associated with epidote, apophyllite, &c. 



New Haven, June 20, 1849. 



6. On the existence of Mercury in the Tyrol; by M. H. Rose, 

 (L'Institut, Fevrier 21, 1849; Lond., E. and D. Phil. Mag., April, 

 1849.) — M. Weidenbusch, in analyzing in the author's laboratory a 

 specimen of tender gray copper ore, stated to be from Schwarz in the 

 Tyrol, found it to contain a notable quantity of mercury, amounting to 

 15*5 per cent. This gray copper is mixed with quartz and sulphuret of 

 copper. Its powder is almost black, and has a specific gravity of 51075 ; 

 when heated in a flask, it yields a little metallic mercury with a light red- 

 dish-brown sublimate. If it be mixed with carbonate of soda and heat- 



ed, a large quantity of mercury is obtained. It contains also zinc, iron, 

 antimony and sulphur, and traces of arsenic and silver. These sub- 

 stances exist in it in the same proportions as in other gray copper ores. 

 A crystallized gray copper, also stated to be from Schwarz in the Tyrol, 

 aid not contain any mercury. 



7. Mud of the Nile.— The following analysis of the mud of the Nile, 

 by M. Lassaigne (Journ. de Pharm., t. v, p. 468), is more recent and 

 complete than that given by Lieut. Newbold from Regnault. 



Silica, 

 Alumina, 

 Magnesia, . 

 Peroxyd of iron, 

 Carbonate of lime, 

 Carbonate of magnesia, 

 Humic acid, 

 Water. . 



42-50 

 24-25 



105 

 13-65 



385 



1-20 

 2-80 



10-70 

 10000 



