J. Stansfield — New Mode of Occurrence of Scapolite. 39 



ages at right angles. The development of the prism faces of 

 the first and second order, m(110) and a (100), is well shown in 

 basal sections of those individuals which crystallized before 

 the quartz. It has a high birefringence, indicating it to be 

 nearer meionite than marialite. The analysis confirms this. 

 Some sections show abundant inclusions of the type charac- 

 teristic of scapolite. Some of them are negative crystals and 

 occur with definite linear arrangement with their elongation 



Fig. 1. 



Fig. 1. Smoothed upper surface of pegmatite dike with banded gneiss 

 below it. Walker mine, Quebec. 



parallel to one of the cleavage directions, while others show 

 roughly circular cross-section and have no definite arrangement. 

 The latter type may be unpropitious sections of negative crys- 

 tals. The nature of these inclusions has not been more closely 

 investigated. 



There is a small amount of a chloritic mineral present. It 

 has been formed at the expense of the scapolite and is asso- 

 ciated with graphite. A part of the chloritic mineral shows 

 radial arrangement. Calcite occurs in very small amount 

 within the scapolite and with the chlorite and is probably a 

 decomposition product of the scapolite. 



