CRANBOURNE, ROWTON, AND MIDDLESBROUGH. 
893 
does not accord very well with the analysis of the powder, and the relation of one 
body to the other must be left till fresh material comes to hand. 
VII. Curious crystals with dark centres , occurring in the Cranhourne siderite. 
Mention should here be made of a curious crystal which on two or three occasions 
was met with while searching through the debris of the meteorite. It consisted 
apparently of a square prism, which, while the sides were quite bright and metallic, 
had a square centre of a dull almost black colour; it very readily broke across the 
prism. On Plate 53, fig. 3, is represented such a prism broken across, showing the 
dark centre. An analysis of this compound gave the following results :— 
Iron. 67‘480 -t-28 2*410 
Nickel. 20*318-^29*5 0*688 
Phosphorus .... 12*317-r-31 0*397 
100*115 
which numbers agree with the formula (Fe 7 Ni 2 ) 8 P. 
VIII. Graphite. 
Graphite occurs occasionally, but rarely, as nodules ; sometimes as nodules, enclosing 
troilite, like the one already referred to; sometimes in large sheet-like masses, in one 
case about four inches in length and two inches wide. A specimen was carefully 
dried and pounded and burnt in a current of oxygen and gave numbers which show it 
to have the composition : 
Carbon. ........ 89*661 
Hydrogen. 0*257 
Residue (iron, &c.). 10*412 
100*330 
IX. Gases occluded by the nickel-iron. 
The nickel-iron was further examined for occluded gases. A portion of the nickel- 
iron borings removed from the under- surface was selected and was heated in a 
porcelain tube connected with a Sprengel pump. Gas amounting in bulk to 
3*59 times the volume of the iron was extracted and was found on analysis to 
have the following composition ;— 
