456 



DK. W. FLIGHT, GREENLAND METEORITES. 



analyses under III. Some of these spangles could be pulverized 

 only with difficulty, and were readily flattened out ; the spherules, 

 though so hard that a sharp steel file would scarcely touch them, 

 were easily crushed. They had the following composition : — 



Iron 



- 58-25 



Alumina - 



- 



- 1-45 



Nickel - 



- 2-16 



Nickel and cobalt 



ox- 



Cobalt - 



- 0-30 



ides 



. 



- 0-44 



Copper - 



- 0-13 



Magnesia 



- 



- 0-33 



Hydrogen 



- 0-28 



Lime 



- 



- 0-50 



Carbon - 



- 1-64 



Soda 



- 



- 0-09 



Sulphur - 



- 0-16 



Potash - 



- 



- trace. 



Chlorine 



- 0-16 



Residue - 



- 



- 6-07 



Magnetite 

 Silicic acid 



- 30-42 



- 0-26 













102-64- 



Phosphoric acid 



trace. 









In the basalt of the ridge, of which an analysis is given under 

 II. in the same table, a compact, very brittle, yellow, or slightly 

 brown mineral occurs in thin flakes, sometimes in nodules of the 

 size of a pea ; it is invariably penetrated and usually surrounded 

 by a mineral resembling hisingerite, to which attention will pre- 

 sently be directed. The mineral has a hardness of 5 to 5 - 5, and 

 easily fuses before the blowpipe, with evolution of sulphurous acid, 

 to a magnetic regulus. It has the composition : 



Equivalent 



258 



100-00 100-00 



These numbers give the formula (Fe,Ni)S5 or that of the iron 

 (nickel) monosulphide or troilite, which has hitherto only been 

 met with in meteorites. 



Intimately associated with the troilite, and evidently a product 

 of its oxidation and further alteration, is the mineral already 

 mentioned, the fresh fracture of which is of a light olive-green 

 colour, that by exposure to the air soon becomes brown, and after 

 some days turns quite black. 



Its specific gravity is 2-919 ; and its composition : 









Katios. 



Iron - 



- 52-94 ■ 



• 57-91 - . 



■ 2-068 1 

 - 0-190/'^ 



Nickel 



- 5-06 ■ 



■ 5-53 - 



Copper 



trace • 



trace - 



— 



Sulphur 



- 33-41 ■ 



■ 36-56 - 



- 2-285 



Silicate 



- 8-59 



— 



— 



Silicic acid 

 Iron sesquioxide 

 Iron protoxide - 

 Water 



- 31-70 



- 51-49 



- 3-81 



- 15-56 



Oxygen. 



- 16-90 



- 15-44 



- 0-85 



- 12-05 





1 00 -56J 





These numbers indicate the formula : 



FeO,Si02-f3(2Fe203,3Si02) + 14Il20 

 as that of the mineral. NauckhoflT, however, draws attention to 



