DR T. THOMSON'S Analysis of some Minerals. 445 



4. Sp. Anhydrous silicate of iron from the Morne Moun- 

 tains, described and analyzed in this paper. 



5. Sp. Hedenbergite, found at Tunaberg, in Sodermanland, 

 Sweden, and described and analyzed by HEDENBERG *. Its con- 

 stituents seem to be, 



3 atoms silica, . ., (r , , r . 6 



1 atom protoxide of iron, . . 4,5 



2 atoms water, 2.25 



12.75 



r^-- ' . . ' . - t .' * /V^ ! ( J . , (/-,- ;; 



6. Sp. Chloropal, discovered by JOSEPH JONAS, near Unghwar, 

 in Hungary, along with the opal, and described and analyzed by 

 BERTSTHARDI and BRANDES f . Its constituents are, 



3 atoms silica, 6 



1 atom protoxide of iron, . . 4.5 

 2^ atoms water, 2.8125 



13.3125 



7. Arfwedsonite, so called by Mr BROOKE, but formerly known 

 by the name of Ferruginous Hornbknde, brought from Kargard- 

 luarduk in Greenland, by Sir CHARLES GIESECKE'. It was ana- 

 lyzed several years ago in my laboratory, and found composed of 



15 atoms silica, 

 4 atoms peroxide of iron> 

 1 atom deutoxide of manganese. 



* Afhandlingar, ii. 154 f SCHWEIGGEE'S Jahrbuch, v. 29, 



3K2 



