of the P v r i t e s. 39 



3. \nfpad which is direclly oppofite to quartz, 

 being a flakey, crumbiey, ihivery, calcaneus (tone, 

 more frequently entirely white, but fometimes of 

 a brown -red or ruffe t, as well as of other colours, 

 and fofter than quartz 5 io as to bear being 

 fhaved with a knife, nay often with the finger- 

 nails ; whereas quartz often approaches to a 

 diamond in hardnefs •, tho' fpad be heavier than 

 quartz, to a degree of giving a ftrong fufpicion of 

 its holding a metallic body, little or no metal hath 

 hitherto been procured frcm it ♦, this fpecies of (tone 

 having conceived more of the mercurial, metallic 

 earth than of the quartzy, glaily, firft earth of 

 BecTier ; now in and upon this fpad the pyrites as 

 readily h\\es, as i: is ccmrnon in our mines. I have 

 had ieveral inllances o\ pyrites in tinny vein- (lone, 

 where Mufcovy-glafs, a fpecies of fpad, ufually 

 breaks. 



4. The pyrites lodges alfo in lime-flone, gypfum, 

 alabafcer, &c. Not vei»-wife 9 hut, rather neft-wife, 

 and kidney-wife, unlefs where other veins, carrying 

 along with them pyrites, happen to traverfe ; as 

 appears from the caicarious fhoad of the Schlofs- 

 berg near Toplitz. 



5. Shiver net only holds cepper-pyrites, or 

 copper pyrites-ore, as being what is common to it, 

 but alfo iron ryrites ; there having been fent me 

 a fample in particular from the Shiver-quarry 

 near Gofiar, where it forms a genuine flat-layer 

 or fquat. 



6. Pyites ledges alfo in llonc-c oals, a thing 

 not to be wondred at from their great afnnity, 

 as both have fulphur in common, which abun- 

 dantly appear* from the Rone-coal works at Pef- 

 terwitz near Drefden 



7. In fand-ftone, of which thofe brown-rec^ 

 ochry, iron- r lift nefts obfervable in frane-quarries 

 are fufficient evidence : and in particular at Burg- 



D 4 thannc 



