73 



In the meantime I have thought it sufficient to arrange them 

 under two general heads, as (a) the so-called non-metallic, and 

 (b) the metallic minerals ; the former (a) being sub-divided 

 into carbon, salts of the alkalies, alkaline earths, and alumina, 

 and the anhydrous and hydrous silicates; and the latter (b) 

 into divisions corresponding with their chief metallic con- 

 stituent. It is hoped that this list of minerals will serve as a 

 starting point, and that contributions in the forms of fresh 

 determinations and new localities may form a not unimportant 

 item in the future transactions of the Society, in which 

 interesting work I trust to be able to personally participate. 

 The nomenclature employed is that adopted by Dana in his 

 "Descriptive Mineralogy." 



XOX-METALLIC MINEEALS. 



CARBON. 



Diamond. 



As far as I am aware the only locality in which this gem has 

 been found is Echunga. The largest example, the property of 

 the South Australian Government, is of a sherry-yellow colour, 

 and weighed before cutting 5^ carats, its present weight being 

 2^ carats. It is cut in the form of a brilliant. A second 

 specimen (also the property of the Government), somewhat 

 lighter in colour than the foregoing, weighed before cutting 

 3^ carats, the cutting reducing its weight to l|-f carats. Two 

 very good specimens, illustrating the crystalline form of the 

 diamond, are to be noted — one weighing 1^ carats, and ex- 

 hibiting the planes of the hexakis-octahedron, and the other 

 w^eighing -^| carats, and presenting the form of the triakis- 

 octahedron. 



Graphite. 

 This mineral occurs at AYarrow, County Flinders, and at one 

 or two localities on the west coast of Spencer Gulf. It has 

 also been found at Mount Charles (G. Erancis) and Mount 

 Torrens (C. Thomas). Burr mentions it as occurring in the 

 Belvidere Eange, and about 23 miles north-east of Adelaide. 



Sulphur. 

 This mineral occurs in a specimen of pyrite associated with 

 quartz from Echunga (the specimen is in the collection of the 

 South Australian Institute). Burr mentions its occurrence 

 near the Montacute copper mine, enclosed in veins of quartz 

 with pyrite. A deposit formed round the mound-springs at 

 Strangways Springs has frequently been reported to be 

 sulphur. It is, however, chiefly salt coloured yellow by a basic 

 salt of iron. 



