Scolecite from a Canadian Locality. 99 



nearly an inch, and mostly a sixteenth to an eighth of an 

 inch in thickness. They occur as single individuals (fig. 1), 

 or in pairs (figs. 2 and 3), or aggregated in groups (figs. 4 

 and 5). Figure 4 is from a specimen 2 J inches square and 

 less than ^th of an inch in thickness. Figure 6 gives the 

 outline of a transverse section of one of the convex concre- 

 tions. Some of the specimens are crusted over by a dull 

 white mineral whose composition has not been determined. 



5. — Dawsonite. 



(Na 2 + Al a 3 +2C0 2 +2H 2 or Na 2 AI 2 C 2 8 +2H 2 0). 



It is worthy of record that this species has been found by 

 Mr. E. T. Chambers at the Corporation quarry on the west 

 side of Montreal mountain. It there occurs in thin radiating 

 blades along the walls and in the joints of a grey trap dyke 

 which cuts the nepheline-syenite, and also in joints in the 

 nepheline-syenite itself. In appearance it closely resembles 

 the mineral from the original localities (McGill College 

 grounds and Montreal Eeservoir), but as yet it has not been 

 analysed quantitatively. 



6. — Ittnerite. 



A grey mineral occurring in the nepheline-syenite of the 

 Corporation quarry has the blow-pipe characters of ittnerite. 

 It contains both chlorine and sulphuric acid, but has not 

 yet been fully examined. 



Scolecite from a Canadian Locality. 



By J. T. Donald, M.A. 



This interesting mineral has recently been found at Black 

 Lake, Megantic Co., Que., in one of the granitic dykes which 

 are so abundant in the serpentine of that locality. The 

 writer's attention was called to it by Mr. Matthew Penhale, 

 Superintendent of the Scottish-Canadian Asbestus Co. It 

 occurs in transparent, glassy needles filling minute veins, and 



