129 



from the east end of this vein, ground in a local flour 

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Barite vein in Ordovician limestone. 



FELDSPAR, CORUNDUM AND 

 SCAPOLITIZATION. 



INTRODUCTION. 



The object of this excursion is to examine certain 

 large pegmatite dykes, from some of which quartz and 

 feldspar are mined in commercial quantities, a good indi- 

 cation of the size and perfection of their crystallization. 

 A rather unusual occurrence of corundum will be seen in 



35064—9 



