liY W. F. PETTERD. 71 



22 Hyalite {Hydrated silica.) 



Occurs in cavities of a hard lode gangiic in white to 

 pale-green botryoidal masses'. Locality : Bell's 

 Reward Mine, Heazlewood. 



23 Hydro CERUS SITE (Basic lead carbonate.) 



In one of the adits at the Hercules Mine, Mount Read, 

 a white fluidal substance was observed in decomposed 

 lode matter, which, on giving up its hygroscopic 

 water, assumed a silvery-white appearance, and which 

 under the microscope is resolved into very minu/te 

 scaJes, but with little or no hexagonal structure. In 

 all essential respects the substance agrees with this 

 species as detailed in " Dana's System of Miner- 

 alogy," page 299. 



24 Lepidomelane frotassiuin mica rich in iron.) 



Occurs in large sixsided tables, occasionally 1 inch in 

 breadth,, of a black colour, and highly ada- 

 mantine. Transparent in very thin laminae, shewing 

 a beautiful emerald green colour. The crystals for 

 the species are remarkably fine, and well developed; 

 they are found aggregated together in association 

 with a peculiar amphibole and quartz, and evidently 

 form portion of a contact on the fringe of granite. 

 Locality: Hampshire, near the old silver mine. 



25 Phlogopite {Magnesium mica with little iron.) 



" This mineral occurs on Section 5367-93m in horn- 

 stone, associated with very large bodies of magnetite 

 and zinc-blende. It occurs in large hexagonal 

 crystals, with a very perfect micaceous cleavage. The 

 colour is light green, varying sometimes to greyish- 

 brown." (Mr. G. Waller, loc. cit.) 



26 Pyrargyi^ite (Silver sulph-anti tuonif e .) 



Ruby silver ore has recently occurred at several minea, 

 notably at the Magnet, where it is not by any meang 

 rare in patches and blebs in close association with 

 galenite. The mineral is sometimes surrounded by 

 frondose and gi'anular native silver, and the con>- 

 bination, need' ess to say, adds materially to the 

 silver assay value of the ore. At the Mount Stewart 

 Mine it occurs sparingly, and in smaU vughs little 

 nests of micro-rhombohedral crystals have been 



