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. 
Hliasite. 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. G.= 
4°76-4°84. 
Blomstrandite. A hydrous titano-columbate, from Sweden. 
Torbernite.—Uranite. Cha'colite. Uran-Mica. 
Dimetric. In square tables, thinly foliated parallel to the 
base, almost like mica; lamine brittle. 
Color emerald and grass-green; streak a little paler. 
Lustre of lamine pearly. Transparent to subtranslucent. 
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. 5.B. fuses to a blackish 
mass, and colors the flame green. 
Diff. 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. 
Ods. 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, alsofrom 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 Zewnerite is a torbernite containing arsenic instead of 
phosphorus. 
Samarskite (formerly named wranotantalite 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. 
