Figs Uralitec augite-syenrtd Duluth, Minn. 
Ordinary light. Scale 20 diameters. 
Orthoclase, ancl oltgoclase. saturated with secone- 
ary or corrosrom quartz (sz, which sometimes jeorms 
large areas; uralrtepsreudomorphs(u/ after augrte ; 
chlorcteis , magnetrte(s/. 
Fe92 Grenitze porphyry from Ironton Trarl, Ashlancl 
County, hs. Ordinary light Scale a7 deameters 
Reddened Jeldspars saturated oreth secondary guaré2(2, 
Inagnetzte(ss, greenzsh alleration product (4) 
Frg.2. Augetic granitedd Srom the north shore of Lake 
Superior, Sec.32, [9t,R7t Minn. Ordinary light. 
Scele so diameters 
Orthoclase/and olegoclave much altered; guartz posst: 
bly tn partprimary ; green alteration product of 
augzte (4) 22 clusters between the Layer feldspars, 
Fig. Augite -syenrte Srom pebace tn conglomerate, 
Mt Bohemia, Hereenan Point, Mech. Ordinary light. 
Scale -27 drameters. 
Orthoclase tai(trinned) and lahradorztels both saturated 
mith secondary guatz arranged im fene Cones ($e) and tw 
regularly outlined areas (shy, ferritic alteration) of augite 
