BY W. F. PETTERD, C.M.Z.S. 173 



of the mixed material have given returns at the rate of 

 several thousand ounces of silver to the ton of ore. It is 

 reported to occur on the footwall of the extensive inter- 

 bedded formation of cupriferous pyrites for which the 

 locality is now well known. 



Analysis of an amorphous slug from the Mt. Lyell 

 Mine : — 



Per cent. 



4507 oz. 19 dwt. 23 gr. per ton. 



320. Strontianite (Carhonate of Strontium). 



Found in small veins and pockets, usually of a white 

 satiny appearance, at the Hampshire Silver Mine (W. R. 

 Bell). This substance is not known to occur at any other 

 locality in the island. It was obtained irregularly mixed 

 up with lode-matter, with fluorspar, apatite, and several 

 minerals, w^hich, like it, are almost peculiar to this inter- 

 esting locality. 



321. Sulphur, Native. 



The decomposition of pyrite gives rise in some cases to 

 the elimination of native sulphur, as has been the case in 

 portions of the Bischoff Tin Mine. It is an extremely 

 rare substance in Tasmania ; the occurrence mentioned 

 being the only instance affording an appreciable quantity. 

 It occurs as a powdery mass intermixed with pulverulent 

 quartz resembling geyserite at the south-western face of 

 that portion of the mine known as the " Brown Face," and 

 is naturally in close association with masses of iron pyrites, 

 which occur more or less underlying a highly ferruginous 

 crust, which probably originated through the alteration 

 of the pyrite. It has been detected in small quantity as 

 extremely minute microscopic crystals encrusting the frac- 

 tures of galena of several of the mines at Zeehan. 



322. Symplesite (Hydrous Iron Arsenate). 



A rare mineral that has only occurred at the Magnet 

 Mine. It is monoclinic in crystallisation and prismatic in 



