17 



The above description has been chiefly taken from an 

 attentive examination of the specimens of rutile exist- 

 ing in the best collections of Vienna and Saxony. 



SECOND SPECIES. 



RUTILITE. 



Calcareo-siliceotis titaji ore of Kirwan. 

 Titanit of Klaproth. 



EXTERNAL CHARACTERS. 



The colour varies from brownish red to dark reddish 

 brown. 



Has been hitherto found only crystallized in very rhom- 

 boidal four-sided prisms, acutely bevelled at the extremi- 

 ties, the bevelling planes set on the obtuse lateral edges. 

 The crystals are small, and very small, seldom middle 

 sized. 



Exteriorl}', they are shining. Interiorly, glistening, with 

 a resinous lustre. 



The fracture is imperfect and minute conchoidal, pass- 

 ing into the uneven. 



The fragments are indeterminately angular, tolerably 

 sharp edged. 



VOL. X. D The 



Rutile has also been discovered by Von Humboldt, on the summit of a 

 mountain near Caraccia, in New Granada, at the height of 131G toises. — K. J. 



