1866.] Composition of the Dhurmsalla Meteoric Stone. 217 



Collecting together into one view the preceding results, we find — 

 IV. Miner alogical Composition of the Dhurmsalla Meteorite, 



1. Nickel-iron 8-42 f^,^ 



I Nickel 1-54 



2. Protosulph^iret of iron 5 "61 



3. Chrome-iron* 4'16 



4. Chrysolith (^"peridot or olivine) 47 '67 



5 . Minerals insoluble in muriatic acid 34*14 



100-00 



I shall here add, for the purpose of comparison, the results of my ana- 

 lysis of the meteoric stone that fell at Dundrum, co. Tipperary, at 7 p.m. 

 o'f the 12th August, 1865. 



Dundrum Meteorite. 

 Sp.gr 3-066 to 3-570. 



I. Mineralogical Composition. 



1. 





. , . 20-60 



2. 





... 4-05 



3. 





... 1-50 



4. 





. . . 33-08 



5. 



Earthy minerals insoluble in 



mu- 







. . . 40-77 







100-00 



f Iron . . 19-57 

 I Nickel 1-03 



II. Chemical Composition of the Chrysolith. 



Silica 38-74 38-86 



Alumina 0-45 



Protoxide of iron 16-55 .. 19*74 



Protoxide of manganese. . 0*15 



Lime 0-84 0-72 



Magnesia 40-93 36*85 



Potash 0-51 0-47 



Soda 0-24 0*22 



Loss 1-59 3*14 



100*00 100-00 



* The quantity of chrome found in this meteorite is unusually large, being repre- 

 sented by 2-84 per cent, of CrgOg, and by 4-16 per cent, of FeO, Cr.^O., ; yet it is not 

 without precedent, for in the meteoric stone that fell at Nobleborough, Maine, U. S. A. 

 on the 7th of August, 1823, Webster found 4 per cent, of Cr2 O3. 



T 2 



