376 
DESCRIPTIVE MINERALOGY. 
Fig. 399. 
Fig. 400. 
vein of granite traversing gneiss, and is associated with tourmaline, garnet, apatite, feldspar 
and mica. Its colour is usually yellowish green. 
The crystals of chrysoberyl at this locality some¬ 
times exhibit the primary form, and sometimes that 
represented in Fig. 399, which was first noticed by 
Dr. G. Troost,* the anamorpliique of Hauy, in 
which the shorter terminal edges are replaced by 
the planes i: i on i 120°. Also Fig. 400, in which 
the lateral, as well as the shorter terminal edges 
are replaced by single planes. M ons 125° 16'; 
T on s 144° 44'. Most commonly, however, the crys¬ 
tals are flat compound ones assuming a variety of 
forms, as represented in Figs. 401, 402, 403, 
Fig. 401. 
Fig. 402. 
Fig. 403. 
404, 405, 406, 407 and 408; the strise 
being in most cases distinctly marked, 
as represented in the cuts. The man¬ 
ner in which these are produced will, 
I think, be understood by an inspection 
Fig. 404. 
Fig. 405. 
Fig. 407. 
Fig. 406. 
Journal of the Academy of Natural Sciences of Philadelphia. III. 293. 
