190 GEOLOGY OF A 



nal lustre, dull ; internal, glistening : semi-transpa- 

 rent : scratches glass : cleavage, distinct. 



Jlugite Second Variety, 



This variety occurs at Roger's Rock, near Ticon- 

 deroga, associated with Feldspar, crystallized 

 Sphene, and Plumbago. Colour of the mass, light 

 blackish -green, by long exposure to the atmosphere, 

 it becomes dark blackish-green ; colour of the pow- 

 der, greenish- white ; lustre, dull : opaque, in mass ; 

 in thin fragments, slightly translucent : form, regu- 

 lar, octagonal prisms, generally without distinct ter- 

 minal faces : I have one specimen on which there are 

 two terminated crystals; but T do not know that the 

 form is described : it is an octagonal prism termi- 

 nated by four faces, two of which correspond with 

 the two principal faces of the Pyroxene sexoctagone 

 of the Abbe Hauy ; the two other faces may be con- 

 sidered as the result of a decrement upon the edges, 

 formed by the junction of the third terminal face of 

 the sexoctagone with the two principal ones above 

 named : its cleavage, is imperfect : transverse and 

 longitudinal fracture, splintery : fragments, angular : 

 scratches glass : tough: structure, crystalline : the 

 crystals vary from a few lines, to near three inches 

 in diameter. Specific Gravity, 2. 33. 



Coccolite, ( Pyroxene granuliforme of Hauy. J 



The geological position of this, is the same, as the 

 preceding mineral ; of which (both from its physical 



