Siliceous Genus. 147 



VII. VARIETY. 

 Coral Stone. 



This is an aggregate of onyx, fardonyx, 

 rnelian amethyft, and quartz. 



SPECIES II. 



Compounds of the Siliceous with the Calcareous 

 Species. 



I. VARIETY. 

 Quartz and Spar." 



Diftinft grains of each compared together ; 

 the quartz generally white and femi-tranfpa- 

 rent ; the fpar of a brownifh yellow. Sauf* 

 fur 6) 104* 



SPECIES III. 



Compounds of the Siliceous and Earytit Species* 



SPECIES IV. 

 Compound of the Siliceous and Muriatic Species. 



I. VARIETY. 

 Quartz^ Felt-fpar, and Serpentine. 



II. VARIETY. 

 Shoerl and Soap-rock. 



Compared of diflinft mafles of each, 



SauJJiire 104. The foaprock is green, and 



,L 2 the 



