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INDURATED CLAY. 



In Claystones : not schistose. Argillaceous schists. 



Some Porphyry and Amyg- Shales. 



daloid. Limestones : in both 

 Basalt (of some) : when dark classes. 



and hard. 



CLINKSTONE. 



As a simple rock: also porphyritic and amygdaloidal. 



COMPACT FELSPAR. 



Simple, both in the primary and secondary classes. 



In Gneiss. In Greenstones. 

 Porphyries. Augit rock. 



Amygdaloids. Hypersthene rock. 



Syenites. Granite: rarely. 



QUARTZ. 



In Quartz rock. In Argillaceous schist. 



Granite. Sandstones, in both 



Gneiss. classes. 



Micaceous schist. Porphyries. 



Chlorite schist. Syenites and Green- 



Talcose schist. stones : rarely. 



FELSPAR. 



In Granite, In Hornblende schist. 



Gneiss. Actinolite schist. 



Chlorite schist. Quartz rock. 



