40 



DE, THOMAS STERRY HUNT ON THE 



silicates. We shall next notice the action of thermal waters in historic times, and the 

 occurrence of zeolites in the clays of the deep sea, and then pass to the experiments on the 

 artificial reproduction of zeolitic species in the laboratory of the chemist, and discuss the 

 relations of hydrous and anhydrous species. From this, we shall proceed to a consideration 

 of the reactions of the hydrous species of the two groups with magnesian salts. The origin 



TABLE OF ZEOLITES AND RELATED SPECIES. 



Hydrous. 

 Thomsonite. . . 



Gismondite . . . 



Esmarkite.... 

 Fahlunite 



Natrolite 



Scolecite 



Mesolite 



Levynite 



Analcite 



Eudnophite. .. 



Edingtonite 



Laumontite. .. 

 Herschelite . . . 

 Phillipsite .... 

 Chabazit« .... 

 Gehlenite 



Eaujasite 



Hypostilbite . . 

 Puflerite 



Harmotome . . 



Heulandite . . . 

 Ej")istilbite .... 

 Brewsterite . . . 

 Stilbite 



Prehnite 



Chlorastrolite . 



K : r : Si : H 



1:3:4:2 



1 : 3 : 4J : 4i 



1:3:5:1 

 1:3:5:2 



3:6:2 

 3:6:3 

 3:6:3 

 3:6:4 



3 : 

 3 : 

 3 : 

 3 : 

 3 : 

 3 : 

 3 : 



8 : 2 



8 : 2 



8 : 2 



8 : 4 



8 : 5 



8 : 5 



3:8:6 



3:9:5 

 3:9:6 

 3:9:6 



1 : 3 : 10 : 5 



:3 : 12 : 5 

 :3 : 12 : 5 

 : 3 : 12 : 5 

 : 3 : 12 : 6 



3:6:1 



1:2:3:1 



Ca, Na. 



Ca. 



Mg. 

 Mg. 



Na. 

 Ca. 



Ca, Na. 

 Ca, Na. 



Anhydrois. 



Anorthite, Paranthite, Sodalite, 



Nephelite. 



Barsowite, Bytownite, lolite. 



Labradorite. 



Na, Ca, K. 

 Na. 

 Ba. 

 Ca. 



Na, K. 

 Ca, K. 

 Ca, Na, K 

 Ca, Na. 



Ca, Na. 

 Ca, Na. 

 Ca. 



Ba. 



Ca. 

 Ca. 



Ba, Sr. 

 Ca. 



Ca. 



Ca, Na. 



Hyalophane, Andésite, Leucite. 



Oligoclase. 



Orthoclase, Albite. 



Epidote, Zoisite, Meionite. 



of these salts through subaerial decay of exoplutonic magnesian silicates, and their relation 

 to the primeval sea, will then claim our notice ; after which will be considered the probable 

 relations of the clays from the subaerial decay of feldspathic rocks to other classes of rock- 



