On MetalUe Minerals. 335 



estuaries on the northern shore ol" the St. Lawrence.— 

 (Note 4.) 



Magr>etic oxide of iron in situ is characteristic of primary 

 formations and is, when met with, generally perceived to 

 form beds in granite or gneiss, or mica slate, or chlorite 

 slate, or serpentine, or greenstone, (primary,) or sienite. 

 It is with the two last that is has been observed to be 

 associated in this country. Rocks abounding in hornblende, 

 and such are many of those in Canada, often contain it.— 

 According to some authors it has been observed in transi- 

 tion and even secondary rocks, but such an occurrence, I 

 believe to be very rare, if it be even well established as a 

 fact. The Swedish bar so much esteemed every where is 

 manufactured from this species of ore. 



SPECULAR OXIOE OF IRON. 



From the mines close to the establishment at Marmora 

 is taken an ore, which I consider as belonging to this 

 species. It is believed to be the only place in this country 

 where it has been found in any abundance. It occurs 

 associated with red and yellow ochre, sparry iron, and 

 argillaceous oxide of iron, near the junction of the primary 

 und transition rocks, forming discontinuous veins or beds 

 in the former, a sienite. No information can be given as 

 to the quantity which remains, as the spot which has been 

 opened in exploring it and the other ores with which it is 

 associated, is now, apparently, exhausted ; but there is 

 grent probability that more would be found if sought for. — 

 It is with difliculty extracted. The splendent lustre and 

 pavonine tarnish so frcijuently present in this species of ore, 

 and from which cirtumslance it has been named, is absent 

 from the ore in question, but all its, other characters agree. 



■i u 



