JASPER. 555 



by the veins, and as these become numerous in 

 proportion to the base, it forms brecciated jaspers. 



The colours are much varied, but red and 

 yellow with white or colourless veins, are the 

 most conspicuous. 



Sicily appears to abound in the most beautiful 

 specimens of this variety. 



E. Minutely columnar and resembling, except 

 in hardness, the columnar ironstone. Found in the 

 Isle of Man. 



F. With a conchoid al fracture and resinous 

 lustre: pseudo-pitchstone. 



These have been generally enumerated among 

 the pitchstones, as already remarked, and as the 

 colours have been considered important, they are 

 here made a ground for distinguishing the sub- 

 varieties. 



a. Pale yellow. 



b. Ochre yellow. 



c. Brick red, 



d. Brown, and purple brown. 



e. Green. 



f. Mottled with different colours. 



The green variety is coloured by chlorite, and 

 occurs in Iceland. They all pass into clay, and 

 the transition is often found even in hand speci- 



