181' Outlines of the Mineralogy and Geology 



CLASS lY ,—METALLTCE FOSSILS. 



Genus I. — Copper. 



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SPECIES i.-^rn{iT0us coffer. 



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Pjritous Copper, Cleaveland, p. 452. Copper pjrites, Jamesorij vol. ii. p. 

 193. Copper pyrites, or Yellou' Copper ore, Mrwan, vol. ii. p. 140. Yellovr 

 Copper, Mkin, p. 103. 



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External Characters. 



Its colour is brass yellow ; frequently tarnished brownish 

 purple retl, and pavonine. 



Its lustre is shining and metallick. 

 It is amorphous. 



The streak is similar; its powder is blackish green and 

 faintly glimmering. 



■Km- 



It is semi-hard. 



The fracture is fine grained uneven, passing to imperfectly 

 flat conchoidal. 



It is brittle. 



It is easily frangible. 



The fragments are indeterminately angular and not particu- 

 larly sharp edged. 



Its specifick gravity is about 4.000. 



Chymical Characters. 



Before the blowpipe it first slightly decrepitates, then 



elts 



mg sulphureous odour into a dark reddish brown po 

 which exhibits a slight me talljck lustre when broken 



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