TAB. C. 



CUPRUM oxygenizatum ; van cubicum, 

 Cubical Red Oxide of Copper. 



Syn. Cuivre oxyde rouge cubique. Haiiy, v. 3. 557. 



Ctood cubical crystallizations of Red Oxide of Copper are 

 much rarer than octaedrons: see tab. 53. 



This specimen came from near Redruth in Cornwall. It 

 is crystallized in distinct cubes sometimes, but oftener in. 

 rather irregular groups, yet with their edges and planes 

 parallel to each other, seldom like Fluor, tab. 73, or Galaena,, 

 tab. 24, &c, which are generally more confused. It rarely 

 forms large cubes, although I understand that some have 

 been found a quarter of an inch in diameter. They are 

 often truncated at their solid angles, forming the cubo- 

 octaedre of Haiiy, t. 63 and 71 • The magnified figure re- 

 presents a group somewhat like one on the specimen, which 

 has a large cubo-octaedre at the left hand corner, and the 

 rest consists of various sized cubes, and one or two of an- 

 other group, showing that the different groups may stand 

 in different directions. 



