3 i 6 Mr. Hatchett's Analysis 
that it would be totally superfluous here to give any detailed 
account of them. One of the species, however, merits peculiar 
notice, as possessing the remarkable property of strong magnetic 
polarity ; and, although it has been described by modern mine- 
ralogists,* it does not appear to have been as yet subjected to 
any regular chemical examination ; so that, whether it be a sul- 
phuret of iron inherently endowed with the magnetical property, 
or a sulphuret in which particles of the ordinary magnetical iron 
ore are simply but minutely interspersed, has to this time re- 
mained undecided. 
This species is known by the name of Magnetical Pyrites, 
and is called by the Germans Magnet-Kies , or Ferrum miner ali- 
satum magnetico-pyritaceum. 
It is most frequently of the colour of bronze, passing to a 
pale cupreous-red. 
The lustre is metallic. 
The fracture is unequal, and commonly coarse-grained, but 
sometimes imperfectly conchoidal. 
The fragments are amorphous. 
The trace is yellowish-gray, with some metallic lustre. 
It is not very hard ; but, when struck with steel, sparks are 
produced, although with some difficulty. 
It is brittle, and is easily broken. 
This pyrites has been hitherto found only in some parts of 
Norway, Silesia, Bavaria, and especially at Geier, Meffersdorf, 
and Breitenbrunn in Saxony ; but, having received some speci- 
mens from the Right Hon. Charles Greville, F. R. S. I 
* Kirwan, Vol. II. p. 79. Widenmann, p. 792. Emmerling, 2d edit. 
Tom. II. p. 286. Karsten, p. 48. Brochant, Tome II. p. 232. 
