136 RECORDS OF THE AUSTKALIAX MUSEUM. 



The locality is North-east Dundas between Ringville and 

 Roseheiy, where the limurite forms a lenticular contact mass 

 bounded on the east bv slate of probably Silurian age, and on thi; 

 west In' serpentine. 



From hand specimens in the Museum collection it appears that 

 tlie macroscopic associates of axinite are calcite chiefly in veins, 

 chalcopyrite, pyrrhotite, actinolite in radiating aggregates, and 

 datolite in crystalline masses. To this list Petterd and Twelve- 

 trees from microscopic examination add chlorite, tourmaline, 

 danburite and sphene, while they find that the main mass of the 

 rock is a p3'roxenit(' which here and there receives accessions of 

 axinite and other minerals, thereby becoming "limurite." 



The axinite occurs as well-defined crystals, sometimes reaching 

 a length of 15 or 16 mm., embedded in calcite or datolite and 

 disseminated through the p\'roxene. It is not easy to find a 

 detacliable crystal suitable for the goniometer, and I am indebted 

 to Mr. AN'. F. Petterd for the loan of three crystals, each 

 fragmentary but better than any in our collection and adecjuate 

 for measurement. Tlie colour is clove brown; the specific gravity, 

 determined on a cr3'stal weighing 1-008.5 gram, was found to be 

 3-270. 



The habit recalls tliat of the Nundle and Moonbi axinite, the 

 specimens having tlie same tabular extension parallel to r (111). 

 Here however ,:; (11-) i'^ h,1so a face of considerable size ; both r 

 and t are deeply striated parallel to their intersection. The 

 pi-ism faces are not prominent and are slightly striated parallel 

 to the vertical axis. 



The crystal from which the figures were made measures 

 approximate) v 8 mm. in greatest diameter ; it is broken across in 

 the direction of the edge /• .r. After preliminary "one-circle"' 

 measurement in two zones, several faces were identified and the 

 habit made out ; the ci-ystal was then mounted with the prism 

 zone normal to the vertical circle, and the co-ordinate angles 

 obtained. AVith the exception of r and z, which have both faces 

 present, all the forms were determined from single planes ; the 

 faces _/ (Oil), // (021) and )' (131) gave no distinct signal and 

 were measured in the position of brightest illumination. 

 Owing to tlie difiiculty of accurately centring, and the small size 

 and imperfections of some of the faces, the measured and 

 calculated angles do not ahvays agree closely. 



In the table below the calculated angles are taken from 

 Goldschmidt's " Winkeltabellen," but Dana's position antl 

 lettering ha^'e been adopted as before. 



