1865.] Mining, Mineralogy, and Metallurgy. 119 



magnesia, consituting a new species, to which he gave the name 

 chladnite. 



Several years after this examination, Professor Smith has obtained 

 fragments of the meteorite, and has been able to separate the 

 " chladnite " perfectly pure, and in sufficient quantity to submit it 

 to a thorough analysis, the result of which shows the composition of 

 the mineral to be — 



Oxygen Ratio. 



Silica 60-12 2 



Magnesia 39-45 1 



Peroxyde of iron • 30 > 1 



Soda 74J 



100*61 



Corresponding to the formula Mg 3 Si 2 equivalent to the general 

 formula of pyroxene R 3 Si 2 . The minute quantity of peroxyde of iron 

 came from exceedingly fine particles of iron diffused through the 

 minerals, and could be seen by a magnifying glass. 



" Chladnite " approaches those forms of pyroxene known as white 

 augite, diopside, white coccolite, &c. ; these last-named minerals 

 having a part of the magnesia replaced by lime. It is identical in 

 composition with Enstatite of Kengott, a pyroxenic mineral from 

 Aloysthal, in Moravia. 



From these observations, it will be seen, that the Bishopville meteoric 

 stone, however different in external characteristics from other similar 

 bodies, is, after all, identical with the great family of pyroxenic 

 meteoric stones.* 



In our last Number we recorded the discovery of Langite, a new 

 mineral in Cornwall, by Mr. N. S. Maskelyne. This mineral has 

 been analyzed by M. Pisani, who gives the following as its com- 

 position : — 



Sulphuric acid 16-77 



Oxide of copper 65*92 



Lime 0-83 



Magnesia 0*29 



Water 16-19 



100-00 



This gives the formula (Cu) 4 S + 4 aq. Langite differs from broc- 

 hamtite, by its containing one equivalent more of water.j 



Devilline is the name given to a new mineral species from Corn- 

 wall, associated with langite. 



This mineral is of a lighter colour than langite, and of a fibrous 

 lamellar structure, with a milky lustre. Composition according to 

 Pisani — 



Oxygen Ratios. 



Sulphuric acid 26-65 3 



Oxide of copper 51*01) 



Lime 7-90| 3 



Protoxide of iron 2-77) 



Water 16-60 3 



* ' Silliman's Journal,' Sept. 1864. t ' Les Mondes,' Nov., 1864, 



