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GRANITE 
Exposed in valleys of main streams near 
headwaters (usually). Coarse or intermediate 
in texture. Even-grained or slightly porphyritic. 
Chief minerals: feldspar (orthoclase and aloit®- 
oligoclase) , quartz, and hiotite. Minor minerals 
hornblende and epidote. 
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DIORITE 
Exposed in a few localities. Varies in composition 
from true diorite to monzonite. Medium to coarse-grained, 
not porphyritic, greenish gray in color, occasionally 
mottled from kaolinization of the feldspars. The chief 
mineral is feldspar (andesine and oligoclase-andesine ) . 
Quartz occurs in variable quantities, being greates in 
the monzonite variety. Chief femic mineral is hornblende 
which comprises about \Q% qf^J^e rock. Minor constituents 
include epidote, chlorite, magnetite /‘kria pyrite. 
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