130 



anorthosite, and examples of scapolitization will also be 

 seen. In a series of augite gabbros, the feldspars have 

 changed to scapolite, while the pyroxene has changed to 

 uralite, producing an interesting rock, good samples of 

 which may be procured. Associated with this rock is a 

 body of titaniferous magnetite, which was formerly mined. 

 The route of this excursion lies entirely in Pre-Cambrian 

 country. 



Miles and 

 Kilometres. 



o m. 

 o km. 

 25 m. 

 40 km. 



ANNOTATED GUIDE. 



Kingston. Travelling from Kingston over 

 the Kingston and Pembroke 



Verona. railway to the village of 



Verona, carriages will take 

 the party to the Richardson feldspar mines 

 on Thirteen Island lake. Half a mile ( • 8 km.) 

 from the town is an exposure of Grenville 

 dolomite containing graphite, chondrodite, 

 and phlogopite mica in small crystals. One 

 and a half miles (2 -4 km.) farther on is a large 

 pegmatite dyke, in which feldspar and quartz 

 are so largely developed that they have been 

 mined separately and shipped for industrial 

 purposes. 



33 m. 



52-8 km. 



Richardson 

 Feldspar Mine. 



pegmatite dyke, 



Six miles (9.6 km.) farther on lies the 

 Richardson Feldspar mine, 

 the largest mine of its kind 

 on the continent. This 

 deposit is an enormous 

 from which the potash 

 feldspar and the quartz are mined separately. 

 In the process of treatment the feldspar is 

 fused, and forms a glaze for such clay prod- 

 ucts as earthenware dishes, electrical insu- 

 lators, reflectors, porcelain tubs, bath-room 

 fixtures, and household untensils. The 

 quartz is used in electrical furnaces at Niagara 

 Falls for fluxes, ferrosilicon manufacture, 

 artificial abrasives, carbide, and other manu- 

 factures. This mine has turned out as much 

 as 30,000 tons of feldspar in one year. The 



