122 Scientific Proceedings, Royal Dublin Society. 
the strike of the foliation of the gneiss, veins of pegmatite and 
epidote occur in the vicinity in some abundance. 
The stilbite has a laminated somewhat hackly structure, and 
is of a bright salmon colour with a pearly lustre. Under the 
blowpipe it acts in the characteristic manner of stilbite, but it has 
not yet been submitted to regular chemical analysis. 
Associated with it there are plates of quartz, which appear to 
be pseudomorphic after micaceous iron. Such pseudomorphs 
together with those of barytes and gypsum occur very commonly 
in India with infiltrated and occasionally brecciated matter along 
lines of fault and fracture. The few small specimens of these 
pseudomorphs which I exhibit, will serve to convey some idea 
of the general appearance of this fault-rock which often from its 
hardness, forms strongly marked ridges at the surface. The pseudo- 
morphs after micaceous iron not unfrequently shew the very deli- 
cate superficial etching which is characteristic of that mineral. 
Occasionally portions of the original ore are found included in the 
quartz. From these facts, it seems probable that the stilbite 
occurs rather as a vein or lode than asa part of an intrusive 
dyke. 
The specimens I exhibit I propose to present to the Museum 
of Science and Art, Dublin and to the Museum of the University 
of Dublin. 
