54 REPORT — 1880. 



showing tliem to consist of nodules of iron ; and they also contain lumps 

 of an olive-green mineral, having a distinct and easy cleavage. The 

 greater part of the stony material is of a grey colour with the green mineral 

 irregularly disseminated through it. The masses vary very much in 

 density in their different parts ; the average cannot be less than 4'5. 

 When a mass is broken one is immediately struck with the large nodules 

 of metal among the grey and green stony substance ; some of these will 

 weigh 100 grammes or more. In this respect this meteorite is unique ; it 

 differs entirely from the siderolites of Pallas, Atacama, &c., or the known 

 meteoric stones rich in iron, for in none of them has the iron this nodular 

 character. The large nodules of iron appear to have shrunk away from 

 the matrix ; an elongated fissure of from 2 to 3 millimetres sometimes 

 intervenes, separating the matrix and nodules to the extent of one-half the 

 circumference of the latter. The only mineral which could be picked out 

 separately has a slightly green colour : it occurs in masses, from one half- 

 inch to one inch in size, has an easy cleavage in one direction, and was 

 found to be olivine. The same mineral occurs in minute rounded con- 

 dition in other parts of the material ; and minute, almost colourless, 

 crystalline particles in the cavities are supposed to be olivine. Troilite 

 exists in small quantity. A quantity of the silicates was picked out, 

 separated as far as possible from iron, and treated with hydrochloric acid. 

 The ratio of soluble to insoluble silicates varies very much in different 

 parts of the meteorite, varying from 16 to 60 per cent, for the soluble part. 

 The insoluble consisted of: — 



Silicic acid 54"12 



Iron protoxide . . . . . .21-05 



Chromium oxide trace 



Magnesia 2i.50 



Soda witli traces of K and Li . . . -09 

 Alumina -03 



Oxygen. 

 29-12 

 4-67 



9-80 



0-023 



0-013 



99-29 



This is evidently the bronzite commonly found in meteorites. 



The green mineral is the soluble part of the meteorite ; its cleavage in 

 one direction is very perfect ; its specific gravity is 3-35 ; it has a hardness 

 of almost 7, and is readily and completely decomposed by hydrochloric 

 acid. On analysis it was found to have the composition : 



Silicic acid 

 Iron protoxide 

 Magnesia 



100-35 



The mineral, therefore, is olivine. Dr. L. Smith, who has examined 

 this meteorite, describes a third silicate which is opalescent and of a light 

 greenish-yellow colour, and cleaves readily. It was a difficult matter to 

 obtain enough of the silicate for analysis, but an examination of 100 

 milligrammes gave the following numbers : 



Silicic acid . 

 Iron j)rotoxide 

 Magnesia 



98-39 



