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$o ¥ drype — 4 6 -lry, Ampe. 
Analytical Tables of Minerals 
DIVISION I 
MINERALS FORMING ORE 
The ores of the mines may consist of a mixture of 
two or more minerals, or of a single one. The minerals 
forming the ores generally occur in a more or less im- 
pure state, and hence they are variable in composi- 
tion—a result due to imperfect crystallization. 
In the following division the more common min- 
erals valuable for ores (when occurring in workable 
quantities), are described. Being able to identify or 
recognize the kind of minerals present in an ore, an ap- 
proximate estimate of its value is made possible in any 
case. 
