• 



of Boston and its Vicinity. 183 



JtemavTcs. 



It does not appear to exist in sufficient quantity to be an ob 

 ject for the miner, and is too much mixed with Sulphuret of Cop 

 per to be easily smelted. 



SPECIES III.— JROJV MICJ. 



Micaceons Oxide of Iron, Cleaveland,^. 488. Iron Mica, Jamenon, vol. ix 

 p. 982. Idem, diHn^ p. 116. Micaceous Iron Ore, fCtrwan, vol. ii. p. 184. 



External Characters. 

 Its colour is grey, of which it occurs blackish grey and steel 



Its lustre is glimmering, sbining and often highly splendent. 

 It is amorphous, and in thin diverging plates, which often in- 

 tersect each other and form cells. 



The streak is brownish purple red. 

 It is semi-hard. 



The fracture is straight and curved foliated, with a single 



cleavage ; the cross fracture is iBne grained uneven. 



It is brittle. 



It is easily frangible, . 



The fragments are tabular^ wedge-shaped; and rather sharp 

 edged. 



* 



Its specifick gravity is about 4'.955. 



Chymical Character. 



Before the blowpipe it fuses into a blackish shining enamel 



25 



^ 



