CLASSIFICATION OF MINFI.'ALS. 

 C. OXYGEN COMPOUNDS. 



761 



From tlie abundance of oxygen and its nearly universal affinities its 

 combinations form by far the laruest number of the compounds of the 

 elements. The muierals of this division fall into two general groups. 

 To the first group the general name oxides is given ; to the second, oxy- 

 gen salts. The oxygen salts include a number of classes of minerals, 

 such as carbonate, silicate, and phosphate. 



CLASS, — OXIDF.S. 



The compounds resulting from the union of oxygen with other ele- 

 ments bear the general name oxides. Considering the class as a whole, 

 the hydrogen atom or atoms in the typic-al oxide II^O maybe rei)]aced 

 by a single element, as in cuprite CU2O, or by a group of elements, as 

 in gilthite FeO(OH). Further, the oxygen may be replaced in part by 

 sulphur, as in kermesite Sb.S-/); thus giving rise to three general 

 groups: anhydrous oxides, hydroxides, and sulphoxides. 



Tellurite. 

 Selenolite. 



Molybdite. 



Ilscmaunite. 

 Tiingstite. 



Mevmacite 



Arseiiolite. 



Clandetite 



Seiiarmontite. 



Valentiiiite. 



Bismite. 



Peiiclase. 



Ziucite. 



Massicot. 



Mangaiiosite. 



Bunsenitc. 



Tenoritc. 



Melaconite. 



Marcylite. 



Ice (wattT). 

 Cuprite. 



a roup 3. 

 A82O3. 



Sb.,0:,. 



Bi,0,. 



Group 4. 



MgO. 

 ZuO. 

 PbO. 

 MnO. 

 NiO. 

 CuO. 



Group 5. 



H>0. 

 Cu,0. 



Isometric. 

 Mouoclinic. 

 Isometric. 

 Orthorbombic. 



(f) 



Isometric. 

 Hexagonal. 



(?) 

 Isometric. 

 Isometric. 

 MDiiocliuic. 



Hexagonal. 

 Isometric. 



