20 THE MINERALS OF TASMANIA. 



here and there receives accessories of axinite and other 

 minerals, thereby becoming ' limurite.' The axinite occurs 

 as well-defined crystals, sometimes resu^hing a length of 

 15 or 16 mm., imbedded in calcite or datolite, and dissem- 

 inated through the pyroxene. It is not easy to find a 

 detachable crystal suitable for the goniometer, and I am 

 indebted to Mr. W. F. Petterd for the loan of three crys- 

 tals, each fragmentary, but better than any in our col- 

 lection, and adequate for measurement. The colour is 

 clove-brown ; the specific gravity, determined on a crystal 

 weighing 1'0085 gram., was found to be 3"270. The habit 

 recalls that of the Nundle and Moonbi axinite, the speci- 

 mens having the same tabular extension parallel to r (111). 

 Here, however, 5 (112) is also a force of considerable size; 

 both r and 5 are deeply striated parallel to their inter- 

 section. The prism faces are not prominent, and are 

 slightly striated parallel to the vertical axes. The crystal 

 from which the figures were made measures approximately 

 8 mm. in greatest diameter ; it is broken across in the 

 direction of the edge ;• :c. After preliminary ' one-circle ' 

 measurement in two zones, several faces were identified; 

 and the habit made out ; the crystal was then mounted 

 with the prism zone normal to the vertical circle, and the 

 co-ordinate angles obtained. With the exception of r and 

 5 which have both faces present, all the forms were deter- 

 mined from single planes; the faces / (Oil), y (021) and 

 y (131) gave no distinct signal, and were measured in the 

 position of brightest illumination. Owing to the diflB- 

 culty of accurately centring, and the small size and 

 imperfections of some of the faces, the measured and cal- 

 culated angles do not always agree closely." 



Geologically the occurrence of the axinite-bearing rock, 

 limurite, is of considerable interest. It has not yet been 

 demonstrated as to whether it is an intrusive or an altered 

 contact phenomenon ; in all probability it will eventually 

 be shown that the latter is the more correct interpretation 



.34. AzuRiTE (Blue Carbonate of Copper). 



This beautiful mineral is only known to occur in this 

 island as thin scaly masses, and as extremely minute 

 crystals. 



Localities : Hampshire Hills, Gad's Hill, Dundas, Zee- 

 han, Mainwaring Inlet, Mackintosh River, Penguin, 

 Saxon's Creek, Cascades, Heazlewood, near Scamander 

 River, and other places 



