Sw 



17<5 Outlines of the Mineralogy and Geology 



SPECIES XVII.— P/JVYTE. 



7 



Pinite, Cleaveland, p. S58. Idem, Jameson^ vol. ii. p. 552. Idem, Aikin, 

 p. 206. Micarolle, Kirwan, vol. i. p. 212. 



External Characters, 

 Its colour is grey, of which it occurs greenish grey and black- 



ish grey. 



Its lustre is glistening, and resinous.. 

 It is opaque. 



It is crystallized in acicular six-sided prisms. The crys- 

 tals are very small and imperfect, and their forms are determined 

 with difficulty. The surface of the crystals is smooth. 



The streak is light ash grey. 



It is semi-hard passing to soft. 



The cross fracture is foliated, with a single cleavage, per- 

 pendicular to the axis of the prism j the longitudinal fracture is 

 uneven. 



* . ■ 



It is brittle. 



It is easily frangible. 



Chymical Character, 

 It is infusible before the blowpipe. 



Geological Situation and Locality, 

 It occurs in very small quantity, disseminated in Basalt 



Charlestown 



Remarks, 



This is -a very rare mineral in this vicinity ; we have met witl 



b»t very seWom, an<I this in quantities barely sufficient for de 

 ription. 



