BY W, F. PETTERD, CM.Z.S. 177 



" Japan " black suitable for giving a lustrous 

 black coating to wood or iron work. 

 In the Mersey petroleum, compared with other 

 petroleums, there are : — 



(1) A very much greater proportion of heavy viscous 



oils suitable for lubricating oils. 



(2) A greater proportion of the higher hydrocarbons. 



(3) A greater proportion of nitrogenised bodies, from 



some of which azo-colouring matters and other 

 valuable by-products will be obtained. 



(4) A larger proportion of olefines and napthenes in 



the oils. 



325 Tennantite ( Sulpharsenide of Copper and Iron). 



A variety of fahl-ore containing As. It is dark in 

 colour, inclining to iron-black ; lustre opaque, metallic ; 

 and has a brittle, uneven fracture. " The arsenical variety 

 (of fahl-ore) is also found at Mt. Lyell, in the rich second- 

 ary vein in the Mt. Lyell Mine, associated with bornite, 

 stromeyerite, and chalcopyrite." (R. Sticht.) 



Analysis of a sample from No. 4 adit, Mt. Lyell Mine:—- 



Respecting the occurrence of this mineral at Mt. Lyell 

 Mr. R. Sticht supplies the following not^ : — "This occurs 

 in the Mt. Lyell open-cut in the heart of the ore-body, and 

 appears to be contaminated with a little iron pyritJes or 

 copper pyrites. The general analysis was as follows: — 



Per cent. 

 Insoluble residue, 



?.e., silica = 0-1.5 



Iron = 3-05 



Copper = 41-4 



Zinc = 6*5 



Arsenic = 16*55 



Sulphur = 28-3 



Antimony = 0-35 



Calcium oxide := 0-3 



9()-6 



The difference from 100 per cent, is surmised to be water 

 or moisture. However, the sample analysed was dried at 



