NOTES ON SOME NEW SOUTH WALES MINERALS. 363 



It is clearly an oxidation product of the colbaltine which 

 accompanies it. 



Gahnite — Zinc spinel = Zn A1 2 4 . 



The lavendar coloured specimen was sent me for identification 

 ten or twelve years ago, but without locality. 



Mr. D. A. Porter also sent me a specimen of this mineral from 

 near Tenterfield for identification in 1885, and another from 

 Tingha in 1887, so that the mineral probably occurs in several 

 localities. 



Garnets. 



From the New England District, on the borders of Queensland, 

 these are the ordinary red garnets (iron-alumina garnet), but like 

 those found in Queensland have been mistaken for rubies. 



The Bohemian garnet, magnesia alumina garnet, is said to occur 

 in large quantities near Maryland Creek, Co. Buller. 



Graphite. 



From Undercliff Station, Wilson's Downfall, New England, 

 obtained by Mr. Wooler. 



The nodules of this graphite look of very good quality when 

 rubbed and polished, but on breaking them open they are seen to 

 contain a good deal of earthy matter ; one nodule examined for 

 me by Dr. G. S. Mackenzie in the University Chemical Laboratory, 

 was found to contain only 30 per cent, of carbon. Hence for 

 most commercial purposes the graphite would require purifying 

 before it could be used. Associated with the graphite are rolled 

 pebbles of quartz and rock crystal. 



Gold. 



Amongst the specimens forming the subject of these notes and 

 placed before you on the table is a specimen of gold in calcite, 

 obtained from the New Reform Gold Mine, Lucknow and sent to 

 me by Mr. Newman as an unusual specimen. 



The gold is very pale in colour and of a greenish tint, and 

 occurs in the form of very thin films and strings, which follow the 

 cracks in the calcite and junctions of the crystals rather than the 

 cleavage planes of the crystals. The calcite cleaves well, is white, 

 but shows iron stains in parts. 



There are also two specimens of auriferous quartz from the 

 celebrated early find of Gold in Louisa Creek, Turon River, 

 obtained on the spot in 1851 by Mr. J. Alger, to whom I am 

 indebted for the specimens. The quartz is ordinary white vein 

 quartz with ferruginous stains and cavities apparently left by the 

 removal of iron pyrites. 



