Chemical Examination of Ookumitc. dl 



ail eight-sided prism, terminated by eight-sided pyramids, of 

 which the summits are truncated. 



It appears that the Humite was first noticed by Bournon, 

 in a pnhlication entitled, " Catalogue de la Collection mine- 

 ralogiqiit pariiculiere du Roide France. Paris 1817." Count 

 D'Oiisson's analysis of the chondrodite was published (he 

 same year, so that it is difficult to say which name of the 

 mineral should take the precedence. 



19. GOKUMITE. 



In the year 1814, I received a collection of Swedish mine- 

 rals from Mr. Swedenstjerna, among which vvas one of a 

 yellowish-green color, labelled Mineral from Gokum quarry. 

 In its general aspect it bore a close resemblance to a mineral 

 from the same quarry, called Loboite by Berzelius, and first 

 described and analyzed in 1807, by Mr. C. A. Murray, under 

 ihe name of a green colored mineral from the lime quarry of 

 Gokum."^ In 1810 a new description of it was publish d by 

 Chevalier Lobo du Silviera, together with an analysis of it 

 by Brizelius.f Lobo called it Gahnite ; but as this name 

 had been already applied to the automalite, Berzelius gave 

 it the name of Loboite. This mineral has been generally 

 considered as a variety of idocrase. My specimen resem- 

 bling Loboite in its external characters, I did not pay particu- 

 lar attention to it, till I happened to give a piece of it for 

 analysis to two of my pupils, Messrs. Hilton and Mitchill. 

 The result of the analysis was so difl'erent from that of Ber- 

 zelius, that I suspt^cted a mistake to have been comu)ittfd, 

 and therefore, repeated the analysis myself. But my re-ults 

 were very nearly the same as those already obtained by the 

 previous analysis. It was obvious, therefore, that my mine- 



Afhandlingar, ii. 173. \ Ibid. iii. 276. 



