Meteorites of Mezo-madaras in Transylvania 143 



These 30-48 parts of uudecomposed residue gave, when ana- 

 lysed with hydi-ofluoric acid, — 



In 100 parts. 



Magnesia 4-600 15-29 



Protoxide of iron . . . 4-643 15-25 



Lime 0-929 3-05 



Ahimina 0-564 1-85 • 



Soda 0-585 I'Ql 



Potassa 0-347 1*13 



Graphite 0-250 0-82 



Cr^O^ 



SiO^ 18-502 60-70 



30-48 100-00 



After subtracting the 19-6 per cent, iron, there remains 50-92 

 per cent, of siUcates soluble in hydrochloric acid, and consisting 

 of— 



In 100 parts. 



Magnesia 19-170 37-64 



Alumina 2-586 5-08 



Lime 0870 1-70 



Soda 1-755 3-44 



Potassa 0153 0-30 



Silica 26386 51-84 



50-920 10000 



From these results, it does not appear to us that any conclu- 

 sion can be drawn as to the composition of the meteorites. The 

 more so, when we consider that even the insoluble part may con- 

 tain compounds which are partially decomposed by the continued 

 action of the acid, and afterwards by the alkali. If the quan- 

 tities of oxygen in the magnesia and iron, the two predominating 

 bases in the insoluble part, be compared with that of the silica, 

 it is almost in the proportion of 1 : 3. We might suppose from 

 this that the chief constituent of the insoluble part is a mineral 

 of the formula MgOl ^^.^ 



FeO S^^^ ' 

 and that the soluble part, which is so rich in magnesia, has for 

 its chief constituent a mineral of a formula similar to olivine, 

 3MgO, SiO^. 



But it is most probable that the mineral constituents are 

 themselves mixtures, as Rammelsberg assumes to be the case 

 with many similar meteorites. The chief mass of the meteorites 

 of Mczci-madaras would then be composed of a mixture of oli- 

 vine, augite, and labradorite, containing besides, uickeliferous 

 iron, iron pyrites, graphite, and a small quantity of chrome- 

 iron ore. 



