Bay St. Paul. 213 



quartz. There are fome fmall grains of 

 fpar in the lime-ftone. All the different 

 kinds of ftone are very well mixed toge- 

 ther, except that the glimmer now and 

 then forms little veins and lines. The 

 ftone is very hard 5 but when expofed to 

 fun-(hine and the open air, it changes fb 

 much as to look quite rotten, and becomes 

 friable $ and in that cafe, its conftituent 

 particles grow quite undiftinguiftiable. The 

 mountain is quite full of perpendicular 

 clefts, in which the veins of lead-ore run 

 from E. S. E. to W. N. W. It feems 

 the mountain had formerly got cracks here, 

 which were afterwards filled up with a 

 kind of ftone, in which the lead-ore was 

 generated. That ftone which contains the 

 lead-ore is a foft, white, often femidiapha- 

 nous fpar, which works very eafily. In 

 it there are fometimes ftripes of a fnowy 

 white lime-ftone, and almoft always veins 

 of a green kind of ftone like quartz. This 

 fpar has many cracks, and divides into fuch 

 pieces as quartz ; but is much fofter, 

 never ftrikes fire with fteel, does not effer- 

 vcfce with acids, and is not fmooth to the 

 touch. It feems to be a fpecies of Mr. 

 Profeffor Walleriuss vitrefcent fpar *. 



* See Walhriufs Mineralogy, Germ, ed, p. 87, Forft, 

 Introd. to Mineralogy, p. 13. 



O 3 There 



