186 Outlines of the Mineralogy and Geology 



Geological Situation and Localities* 



It occurs investing pyritous Copper, at Woburn, and Quartz 



and Amygdaloid, at Brighton, and in rolled masses of Granite, in 

 Medford. 



Mem ark 3. 



A green Carbonate of Copper is said to have been found in 

 this vicinity, and for which the above described mineral has 

 probably been taken ; the chymical characters snfliciently dis-- 

 tinguish them. We have met with no traces of Malachite or 

 green Carbonate of Copper. 



Genus II.— Iron. 



h 



r 



SPECIES I.SULPHURET OF IROM 



Common Sulphuret of Iron or Pyrites, Chaveland, p. 478. Common iroit 

 pyrites, Jameson, vol ir. p. 253. Pjrites, Kinvan. Common pyrites, .9ikw, 



p. 112. 



External Characters, 



Its colours are pale brass yellow and yellowish grey, fre- 

 quently tarnished reddish brown and colnmhinn. 



Its 



g, glimmering, and metallick 



It is amorphous, and crystallized in cubes, which 



are g 



tlly perfect and single ; but also frequently the edges and andes 

 of the smaller crystals are truncated, and they are variously 

 s:rea!ated. 



ag- 



©*v/g, 



The surface of the crystals is smooth and shining 

 It emits a faint sulphureous odour when rubbed. 

 The powder is blackish areen. 



