60 MINERALS AND GEOLOGY 



Fourthly, a group of Fluorides and Chlorides, compounds of fluorine 

 or chlorine with bases. And, finally, a small group of carbonaceous 

 matters, usually classed as Organico-Chemical substances, and re- 

 garded commonly as products of alteration derived from Organic 

 Nature. The sub-divisions of the system adopted, are shewn by 

 way of index, in the annexed tabular view. 



I. SIMPLE SUBSTANCES : 



A. Native Non-Metallic Substances (12). 



B. Native Metals (3-10). 

 II. ARSENIDES AND SULPHIDES : 



A. Sulphides of Silver, Lead, and Zinc (11-13.) 



B. Sulphides of Copper (14-16). 



C. Arsenides and Sulphides of Nickel and Iron (17-22). 



D. Sulphide of Molybdenum (23). 



E. Sulphides of Bismuth and Antimony (24-26). 

 III. OXYGEN COMPOUNDS : 



A. Copper Oxides (27 -28). 



B. Iron Oxides : 



(1) Hematite group of Iron Oxifles (29-30). 



(2) Magnetite group of Iron O^des (31-33* 



(3) Limonite group of Iron Oxiq^s (34). 



C. Manganese Oxides (35-36) 



D. Uranium Oxides (37-38). 



E. Tungstenum Compounds ( 



F. Titanium Oxides (40). 



ft) G. Alumina and Aluminates (41-42). 

 (^r H. Silica and Silicates : 



(1) Quartz group (43). 



(2) Group of Basic Silicates (44-51). 



(3) Group of Pyroxenic Silicates (52-54). 



(4) Group of Chrysolitic Silicates (55-56). 



(5) Group of Feldspathic Silicates (57-59). 



1 6) Group of Calcareo-Feldspathic Silicates (60-64). 



(7) Group of Nephelitic Silicates (65-66). 



(8) Group of Zeolitic Silicates (67-76)' 



(9) Group of Micaceous and Chloritic Silicates (77-81). 



(10) Group of Talcose Silicates (82-83). 



(11) Group of Kaolinic Silicates (84-85). 



(12) Group of Copper and Nickel Silicates (86-87). 



^"oO i I- Carbonates : 



(1) Group of Anhydrous Carbonates (88-93). 



(2) Group of Hydrous Carbonates (94-95). 



K. Sulphates (96-102). 

 L. Phosphates and Arseniates (103-105). 

 IV. FLUORIDES AND CHLORIDES 



A. Fluorides (106). 



B. Chlorides (107). 



V. BODIES or ASSUMED ORGANIC ORIGIN : 



A. Oxalates (108). 



B. Carbonaceous substances (109-113). 



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