328 TRAVELS THROUGH 



and the before-mentioned grey Granite, which 

 here contained white opaque fpots of feld-fpath, 

 Thefe rocks, being but varieties of grey Granite, 

 continued alternating beyond Sterzing. 



Beyond Sterzing appeared mixed with the for- 

 mer rocks a fhivery limeftone, which mixture pro- 

 duced a blueifh-grey hard limeftone ; then fol- 

 lowed a pure, white, and fhivery limeftone ; again 

 horn-flate, and fo on without any vifible order. 



Beyond Brenner ', a poil-ftage in Tyrol, I ob- 

 ferved ftraggling, i. Argillaceous flate of a green 

 colour, with calcareous veins. 2. Black and green 

 gabbro, with white calcareous veins, or rather 

 polzevera. 3. Greenifh quartz, with fmall red 

 garnets. 



Quartz and Glimmer, or Mica, thoroughly and internally 

 blended, fo as not to be diftinguilhed by the eye. Often a 

 good deal of clay is mixed in the fubftance of thcfe rocks. 

 Till we have better claffifications and determinations, I have 

 aid down the preceding ones, for the moft part agreeing with 

 ,our German and Swedifh Mineralogifls and Miners. It was 

 merely to be imderftood, and to underfland myfelf. Conftantly I 

 have employed thefe names in this fcnfe. They may be inconve- 

 nient ; and the rocks which they are meant to indicate may be 

 perhaps but varieties on account of the mixture of their con- 

 ftituent parts, which I do not queflion ; thefe denominations 

 are, however, neceffary and ufeful in mineralogical and oro- 

 log'pal defcriptioni. 



Behind 



