300 PROCEEDINGS OF SECTION B. 



29. Kraurite or Dufrenite. — Green iron ore, hydrated iron 



phosphate. Ullersreuth near Hof. No magnetic 

 particles. 



30. Hornblende Schist. — New Caledonia. Contained a 



little magnetite. 



31. Spinel. — Magnesium aluminate. — Ceylon. Red, trans- 



parent. No magnetic particles. 



32. Spinel. — Elba. No magnetic particles. 



33. Spinel. — Warwick, New York, U.S.A. ; in large black 



octohedra. 32'102 grammes yielded '094 grammes 

 of magnetite. Spinel crystallises in the same form as 

 magnetite, and has the same general formula ; hence 

 the presence of magnetite, even in quantity, would 

 not be surprising. 



34. Garnet. — Franklin, New Jersey, U.S.A. Common 



iron alumina garnet of a brown I'ed colour. Did not 

 yield any magnetic particles. 



35. Franklinite. — Sussex Co., New Jersey, U.S.A. Strongly 



magnetic ; 28*292 grammes yielded 9*131 grammes 

 of magnetic particles, or 32*23 per cent. 



36. Chrome Iron. — New Caledonia. Massive, black, with 



granular structure, but mixed with some steatite. 

 When crushed the powder was of a grey tint, and did 

 not yield any magnetic particles. 



37. Chrome Iron. — New Caledonia. Massive, black. 95*7 



grammes yielded *663 grammes, or '14 per cent, of 

 magnetic particles. 



38. Chrome Iron. — Wollomi, N.S.W. Black, massive ; 



no visible foreign matter except a few particles of 

 steatite. 100 grammes of powder only yielded a 

 trace of magnetite. 



39. Pyrrhoiine, or Magnetic Pyrites, was found to be wholly 



attracted by the magnet, i.e., its magnetic properties 

 are apparently not due to the diffusion of particles of 

 magnetite throughout its substance. 

 39a. Pi/rrhotine, from Sala, Sweden* was also found to be 

 wholly magnetic, except a small quantity of associated 

 earthy gangue. 



40. Auriferous Hcematite. — Mount Morgan. 11*53 grammes 



were crushed and passed through a 60-sieve. No 

 magnetite found. 



41. Jewellers Rouge. — Found to be free from magnetic 



particles. 



