216 TRANSACTIONS OF THE [Apr. 24 
often the case*, the scapolite is secondary after feldspar. But 
no section has yet been procured in which the process can be 
traced. 
Lacroix} has described a rock occurring at Pierrepont, which 
from its character and association is evidently the equivalent of 
the rock under consideration, though differing from it in some 
respects. He also mentions several other localities in the State 
where the same rock occurs with crystalline limestone, the 
association of the two seeming to be quite common. 
Somewhat,similar rocks have been described by Becke{ from 
lower Austria; and there a transition is seen between the 
Fic. 2. Scapolite rock. 
Pyroxene represented with light border. 
Titanite uC SE Ob tge 
Pyrrhotite shaded. 
Scapolite, with irregular change, enclosing all other minerals. 
Width of field, 2 min. 
_* Lacroix, A., Sur. la transformation des feldspaths en dipyre, Bull. Soe. 
Min. Fr., XIV., p.15. Judd, J. W., Mineralogical Magazine, VIII., p. 186. 
__| Lacroix, A., Théses présentées a la Faculté des Sciences de Paris, 1re Con- 
tributions a l’Etude des Gneiss a Pyroxéne et des Roches a Wernérite, p. 183. 
+ Becke, F., Die Gneiss formation des neiderésterreichischen. Waldviertel ; 
Techermak’s Mittheilungen, IV., p. 365, et seq. 
