BY W. F. PETTERD, C.M.Z.S. 103 



in extremely limited quantity implanted in the fractures 

 of jamesonite at the British Zeehan Mine, Zeehan. 



172. Kyanite (Silicate of Aluminium). 



Occurs crystallised in long oblique four-sided prisms, 

 irregularly terminated. Colour usually very pale-blue, 

 commonly translucent, but may be transparent. Occurs 

 in characteristic pale-blue prisms near Mt. Cameron ; also 

 near Hamilton-on-Forth ; Clayton Rivulet (Gould, Pro. 

 Roy. Soc. Tas., 1873). 



173. Labradorite (Polysilicate of Aluminium, Sodium, 



and Calcium). 



The common rock-forming triclinic felspar which is the 

 essential constituent in all basalts and dolerites. It is 

 only known to occur in this island in its micro rock-form- 

 ing character. 



174. Laumontite (Hydrated Silicate of Aluminium and 



Calcium). 



A monoclinic zeolite of extremely decomposable nature. 

 It is flesh-red in colour, but soon fades on exposure. It 

 occurs in the cavities of a metamorphic rock which abuts 

 on to the granite, and forms druses in the hornblendic 

 veinstone at the Hampshire Silver Mine. The crystals show 

 only the unit prism with a steep orthodome. Occurs of a 

 pink colour in lode-fissures at the Shepherd and Murphy 

 Mine, Middlesex. 



175. Lead, Native. 



In its native state this metal is of extreme rarity. Two 

 small specimens were obtained at a mine which was known 

 as the South Nevada at Dundas many years ago, and more 

 recently an example was procured from the gossan outcrop 

 at the Comet Mine, Dundas. 



176. Leadhillite (Sulphocarhonate of Lead). 



This mineral crystallises in the monoclinic system with 

 the common habit of a right-rhombic prism. It is charac- 

 terised by its pearly lustre on the cleavage face, grey to 

 yellow colour, and chemical reactions. At the Victoria 

 Magnet Mine, Whyte River, it has been met with in the 

 form of somewhat large amorphous masses, which rarely 

 have minute crystals attached. They occurred embedded 



