14$ Elements of Mineralogy. 



the fhoerl black. It gives fire with fteel, 



when the fhoerl is ftruck. 



III. VARIETY. 



Quartz and Steatites. 



Obferved alfo by Mr. Sauffure^ the quartz 

 white, and the fteatites green. 



IV. VARIETY. 

 QtartZy Shoerl, and Steatites. 



The fteatites inclofed in the quartz in the 

 form of black kernels. 



SPECIES V. 



Compounds of the Siliceous y and Argillaceous 

 Species. 



I. VARIETY. 



Quartz and Mica. Stellften of the Swedes. 

 Cranitello. 



It ftrikes fire with fteel, and does not 

 eafily melt; and hence ufed for furnaces, &c. 

 When the mica abounds it is of a lamellar 

 texture, its colour is generally grey, or green ; 

 the mixture of mica prevents the filex or 



quartz 



