in the Pyrite s. 105 



ven I know not ; the round pyrites of Alt-fattel» 

 not far from Egra in Bohemia •, the pyrites from 

 the Schlofsberg of Toplitz ; alfo that round py- 

 rites, eafily crumbling or falling to pieces in the 

 air; and the periwinkle and mufcle pyrites, are, all 

 of them, a pure iron-pyrites, without any the leftft 

 copper; alfo excel all others in the fineneis and 

 purity of their fulphur. In a word, the pyrites ot 

 Aciduls, Therms, and other medicinal fprings, 

 nay, all pyritcB in general, that ever came to my 

 hands, and were ever found at mines, in firTures 

 and veins ; or that only break in clay, loam, land, 

 fhiver, lime, and other flone-quarries, are, with 

 refpect to the metal, almoft all pure iron, only 

 that they are often intermixed with a little copper. 

 In Mifnia there is neither mine, nor vein, of what 

 kind foever, coarfe or noble, at what depth fo- 

 ever, in what direction or point foever of the com- 

 pafs; no ore or ftone, of what nature or name fo- 

 ever, where the pyrites does not moftly and prin- 

 cipally confift of iron, the copper adhering to it 

 being fcarce vifible, much lefs educible. All the 

 copper- ores of the following Mifnian mines, viz. 

 the Halfebrucke, Kuhfchaft, Hohenbircke, Kro- 

 ner, BraunfdorfT, Kayfer-Henrich, Zwolf Schluf- 

 feln, &c. are never without copper and iron ; nay, 

 often contain more of the latter than of the for- 

 mer. 



One proof of this propofition, namely, that iron 

 is the ground- earth of all forts of pyrites the mag- 

 net fupplies us with, and fo much the more in- 

 fallible, is this proof, as we know of no other body- 

 thus acted on by the magnet; though its force 

 may be fpoiled, or impeded, upon over- burning; 

 efpecialiy in an open fire, and reducing the pyrites 

 to a brown-red, rally earth : but this earth may 



again 



