MAGNETITE, 301 



42. A 7- ti ficlally prepa,red dry ferric hydrate was also found 



to be free from inag-netic particles. 



43. JBornite, or Purple Copper Ore. — Carn Brae Mine, 



Cornwall, England. Did not yield any magnetic 

 particles. 



44. Iron Pyrites. — Josiiua's Creek, Taupo, New Zealand. 



The specimen is of recent origin, and in process of 

 deposition round decaying wood and twigs in the 

 stream of hot water supplying the baths. In parts 

 it is black and powdery, but was found to be free 

 from magnetic ])articles, 



45. Tinstone Conglomerate. — Vegetable Creek, New England, 



N.S.W, This consists of rolled tinstone, quartz, 

 &c. cemented together by iron oxide. 62*4 grammes 

 of the powder was sent through a 60-sieve, but no 

 magnetic particles were detected. 



46. Serpentine. — Dark oily green colour, from Tasmania. 



234 grammes yielded 8'4 grammes magnetic particles. 

 Magnetic portion = 3'589 per cent. Another speci- 

 men of 50 grammes yielded 2*389 grammes of 

 magnetite. 



47. Serpent me. — Tasmania. Green, with visible specks of 



magnetite. 356-5 grammes gave 28'50] grammes of 

 magnetic particles, or 7'99 per cent. 



48. Serpentine. — New Caledonia. Dark brown, with veins 



of steatite and of magnetite. 212 grammes gave 

 5"92 grammes of magnetic particles, or 2"79 per cent. 



49. Serpentine. — New Caledonia. Similar to last. 173'5 



grammes gave 8"86 grammes magnetic particles, or 

 5*10 per cent. 



50. Serpentine. — New Caledonia. 26*2 grammes gave a 



trace only of magnetic particles. 



51. Serpentine. — New Caledonia. 62*20 grammes gave 



r990 grammes of magnetic particles, or 3*19 per 

 cent. 



52. Serpentine. — New Caledonia. 25*7 grammes gave 3*67 



grammes of magnetic particles, or ] 4*28 per cent. 



53. Serpentine and Asbestos. — Tasmania. 24*0 grammes 



gave only a trace of magnetite. All the asbestos 

 was separated before crushino-. 



54. Serpentine. — Lucknow, N.S.W. Very dark, almost 



black, with thin films of steatite. 33*80 grammes 

 gave 111''^ grammes magnetic particles, or 22*99 per 

 cent. A second specimen of the same, weighing 



