176 PHYSIOGRAPHY. 



ZURLITE. 



Zurlite. PHILL. p. 212. Zurlit. LEONH. p. 663. 

 Form, rectangular four-sided prisms, lengthened in 



the direction of the axis, and having sometimes 



their lateral edges replaced. 

 Cleavage indistinct. Fracture conchoidal. Surface 



rough, generally covered with a white coating, 



sometimes convex. 

 Lustre resinous. Colour asparagus-green. Streak 



said to be pearl-grey. 

 Hardness about 6-0. Sp. Gr. = 3-274. 



It is infusible before the blowpipe, but yields with borax 

 a black glass. Nitric acid dissolves it, partly with effer- 

 vescence, and assumes a yellow colour. 



Zurlite has been discovered and described as above, by 

 REMONDINI, in the Memoirs of the Academy of Naples. 



