1887.] 



NEW YORK ACADEMY OF SCIENCES. 



123 



This extends entirely through the crystals. They are not 

 cavernous like the Paretta, Italy, and Burke Co. quartz. As 



hollow quartz their characteristics are sufficiently marked to 

 isolate them from those found at any other locality. 



It is very evident that these were the result of crystallization 

 from a solution, and the chalcedony, being rounded and coated 



