158 PHYSIOGRAPHY. 



Cube-Ore. 



CUBE-ORE. HexahedralMalachite-Haloide. 

 Primary form. Cube. 

 Secondary forms. 



1. The cube with the alternate solid angles replaced by 

 triangular planes. 



2. The same, but replaced by four planes, three of 

 which rest upon the primary edges, the fourth upon the 

 apex of the new planes. 



3. The cube with its edges and angles truncated. 

 Cleavage, parallel with the primary form difficult and 



imperfect. Fracture conchoidal, uneven. Surface of the 

 cube sometimes streaked parallel to the edges of the sec- 

 ondary faces situated upon the solid angles. The other 

 faces, with the exception of the secondary planes situated 

 upon the edges of the cube, often curved. 



Lustre adamantine, not very distinct. Color olive-green, 

 passing into yellowish-brown, bordering sometimes upon 

 hyacinth-red and blackish-brown ; also into grass green and 

 emerald green. Streak, olive-green . . . brown, commonly 

 pale. Translucent on the edges. 



Rather sectile. Hardness = 2-5. Sp. gr. ^3-000. 



Compound Varieties. Massive : composition granular, 

 rare. 



1. Exposed to a gentle heal, its color is changed into red. In a high- 

 er degree of temperature, it intumesccs, gives little, or no arsenic, and 

 leaves a red powder. Upon charcoal, it emits copious fumes of arsenic, 

 and melts in the inner flame into a metallic scoria, which acts upon tha 

 magnetic needle, 2. Analysis. 



By CHENEVIX. By VAUQXJEL.IJW. 

 Oxide of iron - - 45-50 - 48-00 



Arsenic - - 31-00 



Oxide of copper - - 9-00 



Silica - - 4-00 



Carbonate of lime - - 000 



Water - - 1050 



18-00 

 000 

 000 

 200 



3200 



