t>f the Pyrit e s. 23 



or that regulus, concentrated by fmeJting the 

 coarfer forts of ores, and denominated either 

 from the operation of crude /melting, or from the 

 lead and copper, as the one or the other of thefe 

 happens to predominate. In the operation called 

 crude-working, the fmall or poor, quartzy, rocky, 

 mock-leady ores are, without roafting, fcorified, 

 drained and concentrated, by means of the pyrites 

 naturally adhering to the mix t- work or ore, or of 

 what is purpofely added, into a narrower or fmaller 

 compafs or body, from their otherwife unfeparable 

 and barren minerals ; which body refembles a 

 (lone rather than a metal. The pyrites here em- 

 ployed is commonly julphur --pyrites, in particular 

 the coppery, nay, copper ore itfelf, if to be had. 

 There is nothing extraordinary in this ftone, only 

 the name pyrites has been given to it by cuftom. 



If from the internal we proceed to the external 

 consideration of the pyrites, we mail find them of 

 various figures and colours ; as round, angular, 

 oblong, nakey, &c, and white, yellow, &fc 



The figures of pyrites being extremely various, 

 the following are the principal : 



I. Pyrites idiomcrphos ; which is, 1. fpherical, or 

 hemifpherical-, in this laft form it is generally found 

 radiated and lamellated ; oval, cluftered, criftated. 



2. Angular, confiding of four or fix fides; aid 

 this laft cubical or tefTulated, oblong, rhomboidal, 

 cellular, or honey- combed ; of eight, ten, twelve, 

 fourteen fides, prifmatical, trapezian or irregular. 



3. Bracteated or tabellated. 4. Fiftular or piped. 



II. Pyrites fynmorphos. 1. Lithoxiloidical, as if 

 fibrous, or pyritifl edwood. 2.Conchitical. 3.C0CI1- 

 litical. 4. Cylindrical or Belemnitical. 5. Tur- 

 binitical, or Pyramidal. 6. Conical. 7. Aftroi- 

 tical. 



Thefe various figures of pyrites are reducible to 

 round and angular -, unlefs we except the foliated, 



C 4 and 



