URAN- MICA. 55 7 4. Rectangular four-sided table, bevelled on the ter minal planes, and the edges of the bevelment truncated. 5. Rectangular four sided table, truncated on the ter minal edges, thus forming an eight-sided table. G. Rectangular four-sided table, bevelled on the ter minal edges, and the edges formed by the meet ing of the bevelling planes truncated. 7. Long six -sided table. 8. Long eight-sided table. The crystals are small and very small, and superim posed, and form druses. The terminal planes of the table are streaked, but the lateral planes are smooth. Externally it is usually shining and sometimes splen dent. Internally it is shining, approaching to glistening, and the lustre is pearly. The fracture is foliated, with a fourfold cleavage; but °f the cleavages only one is distinct, which is that paral lel to the base of the prism. The massive varieties occur in granular distinct con cretions. „ », It is transparent and translucent. . It is soft. . ,/u J : It is sectile. : r r It is easily frangible. Specific gravity, 3 1212, Champeaux; 2.190, 3.3, Gre- Chemical Characters. It decrepitates violently before the blowpipe on char- r ° a l; loses about 33 per cent by ignition, and acquires a brass-