94 DOMAIN I, S1DEKQUS. 



from Strelka, in Siberia, with crystals -of felspar 



and globules of steatite, in a base of liver-coloured 



VarioHte of trap. The variolite of the Drac, a torrent which 



Drac. 



throws itself into the I sere beneath Grenoble, also 

 belongs to this division. The base, according to 

 Patrin, is of trap, mingled with clay, or what the 

 German mineralogists would call a wacken, being 

 of a grey or violet colour, with spangles of felspar 

 and globules of calcareous spar; sometimes also 

 with globules of green steatite. In like manner the 

 toad-stone of Derbyshire is occasionally, though 

 rarely, of a light brown colour, with green spots. 

 Saussure regards the variolites as primitive rocks; 

 but Werner only classes them as either transitive 

 or stratiform. 



Black amygdalite, or toad-stone, from Derby- 

 shire. 



The same, with veins or nodules of red jasper. 



Dark brown toad-stone, from the same. 



Light brown, or fawn-coloured toad-stone, with 

 green globules, from the, same. 



Variolite of the Drac, the Hartz, c. 



The calcareous spar sometimes decomposes, 

 and leaves a false appearance of lava. 



