NOME XIV. ACTINOTE ROCK. 133 



must not be confounded with the shorl en masse ' 

 of Saussure, and other French mineralogists, 

 which is siderite. 



Shorl rock is not uncommon in Cornwall ; the 

 substance being generally, if not always, in small 

 crystals, sometimes disposed in transverse radia- 

 tions. 



STRUCTURE I. ENTIRE. 



Shorl rock in small crystals from Cornwall. 

 In very small crystals, elegantly fasciated in va- 

 rious directions, from the same county. 



STRUCTURE II. MINGLED. 



Shorl rock mingled with quartz, from Cornwall. 



Dr. Kidd informs us that Roche Castle, near 

 Bodmin, Cornwall, stands on a rock of this de- 

 scription*. 



NOME XIV. ACTINOTE ROCK. 



Saussure describes, 2281, entire rocks com- 

 posed of grey delphinite ; a kind of glassy acti- 

 note. 



* Outlines, i. 235. 



