BULL. GEOL. SOC. AM 



VOL. 10, 1898, PL. 41 



Fi(iVRK 1. — Pkiimatite Dike exposed at South Lyme, Connecticut 

 The large crystals of microeline are indicated 



FlOUUE 2. — \'lE\V IN THE "SlI.EX" MlNE 



Tills mine is leased on the pulverulent quartz at Lantern Hill, Mystic. The handed structure of 



the quartz is clearly shown 



PEGMATITE DIKE AND SILEX " MINE 



