50 DOMAIN VIII. DIAMICTONIC. 



NOME XV. QUARTZ, WITH BASALTIN. 

 [ToRRiCELLiTE, from Torricdli, A. D. 1640.] 



This is a scarce rock, and may rather be re- 

 ferred to the mixture of siderite with quartz. 



NOME XVI. QUARTZ, WITH SLATE. 

 [GLAUBERITE, from Glauber, A. D. 1650.] 



A diamietonic rock, composed of quartz, im- 

 pregnated with slate*. 



NOME XVII. QUARTZ, WITH FELSPAR. 



[GUERICITE, from Otto von Guerick, A. D. 

 1660.] 



Saussure has described a rock of this nature, 

 the particles being so combined, that it could 

 not be said to belong to either substance. 



* Sauss. 1955. 



