OBDEtt vn. PYfiAMIDAL GARNET. 355 



4. P oo. P 1. P. (P 2) 3 . (P 1)'. 

 P 4 2. (P) 3 . (P) 4 . (P -f- 1)'. P 4- 4. 

 (P4oo)>. [(P4<) 3 ]. P + oo. [P4o]. 

 Fig. 96. Vesuvius. 



Cleavage, P 4 oo and [P -f QD] not very distinct, 

 still less so P QD. Fracture imperfect con- 

 choidal, uneven. Surface, P co sometimes 

 uneven and curved ; the prisms striated parallel 

 to their common intersections, the rest of the 

 faces smooth. 



Lustre vitreous, inclining to resinous, sometimes 

 very distinctly the latter. Colour, various shades 

 of brown, passing into leek-green, pistachio-green, 

 olive-green and oil-green. Streak white. Semi- 

 transparent ... faintly translucent on the edges. 

 If viewed in the direction of the axis, the colours 

 inclined more to yellow, perpendicular to it more 

 to green. 



Hardness = 6-5. Sp. Gr. = 3*399, a perfectly 

 pure fragment of a crystal of Egerane. 



Compound Varieties. Massive: composition gra- 

 nular, of various, sometimes considerable sizes of 

 individuals, often strongly connected. There oc- 

 curs also columnar composition, generally of thin 

 individuals, straight and divergent or irregular, 

 faces of composition irregularly streaked. 



OBSERVATIOKS. 



1. The first varieties of pyramidal Garnet, which at- 

 tracted the notice of mineralogists, were those found 

 among the minerals ejected by Mount Vesuvius. With- 



