170 DESCRIPTIONS OF MINERALS. 



The oxides of uranium are used in painting upon porce- 

 lain, yielding a fine orange in the enameling fire, and a 

 black color in that in which the porcelain is baked. 



Cleveite. Hydrated oxide of uranium, iron, erbium, cerium, yttrium, 

 in cubic forms. From Norway. 



Gummite. An amorphous uranium ore, looking like gum, of a red- 

 dish or brownish color. It is a hydrous uraninite, and has resulted 

 from its alteration. Occurs at Johanngeorgenstadt, and in North Caro- 

 lina. 



Miasite. Another hydrous ore, more or less resin-like in aspect, of 

 a reddish-brown to black color. 



Hatchettolite. A hydrous columbo-tantalate of uranium, in isome- 

 tric octahedrons, resembling pyrochlore from North Carolina. Q. = 

 4-76-4-84. 



Blomstrandite. A hydrous titano-columbate, from Sweden. 



Torbernite. — Uranite. Chalcolite. Uran-Mica. 



Dimetric. In square tables, thinly foliated parallel to the 

 base, almost like mica ; laminae brittle. 



Color emerald and grass-green ; streak a little paler. 

 Lustre of laminae pearly. Transparent to sub translucent. 

 H. --=2-2-5. G.=3*4-3*6. 



Composition. A uranium-copper phosphate, consisting if 

 pure of Phosphorus pentoxide 15*1, uranium trioxide 61*2, 

 copper oxide 8*4, water 15*3 = 100. B.B. fuses to a blackish 

 mass, and colors the flame green. 



Biff. The micaceous structure, connected with the bright 

 green color and square tabular form of the crystals, are strik- 

 ing characters. The folia of mica are not brittle, like those 

 of uranite. 



Obs. Occurs with uranium, silver and tin ores. It is 

 found at St. Symphorien, in splendid crystallizations, near 

 Redruth and elsewhere in Cornwall ; in the Saxon and 

 Bohemian mines ; in North Carolina. 



Autunite is similar to torbernite ; but has a bright citron-yellow 

 color, and is a uranium-calcium phosphate. From the same mining 

 regions, also from near Autun in France, and sparingly, from Portland, 

 Middletown, and Redding, Conn.; Acworth, N. H.; Chesterfield, Mass.; 

 and in North Carolina. 



Uranospinite is an autunite containing arsenic instead of phos- 

 phorus ; and Zeunerite is a torbernite containing arsenic instead of 

 phosphorus. 



Samarskite (formerly named uranotantalite and yttroilmenite) is a 

 compound of oxyd of uranium with columbic and tungstic acids, from 

 Miask in the Ural. It is of a dark brown color and submetallic lustre. 

 H=5 5. G. =5-4-5-7. Abundant in North Carolina. 



