546 W. N. BENSON. 



graphic projection (fig. 13) was constructed. In four 

 crystals examined by Mr. G. J. Burrows, b.sc, and in two 

 examined by myself the presence was noted of acutely 

 tapering domes and pyramids. These faces make exceed- 

 ingly small angles with the normal prism and pinacoid faces, 

 and are very characteristic of aragonite. 



'"'-■'' ''■'■''_":;■' : 



Pyrites crystal may sometimes be found in the breccia 

 ear the basalt neck, they occur in irregular aggregates or 

 i small striated cubes. 



Barytes has been recorded from Dundas by Professor 

 'avid 1 but his specimens were all very small. I was fortu- 

 ate enough to obtain crystals measuring 10x5x2 mm., 

 Qd these were measured on the Adelaide University gono- 

 leter. The presence of the following forms wasdeter- 



' Proc. Roy. Soc. N.S.W., 1893. 



