^66 Scientific Intelligence — Mineralogy. 



Dufresnoy, the other two by M. Brogniart, for the museum and 

 collection of M. de Dree, 



8. Allanite of Greenland. — -This rare mineral occurs imbedded 

 in the granite of Greenland, where it was discovered by the late 

 Sir Charles Giesecke. Mr Allan conjectured it might be a va- 

 riety of gadolinite, but Dr Thomson of Glasgow, who was fur- 

 nished with specimens for examination by Mr Allan, determined 

 that, chemically considered, it must be owned as a new species, 

 which he named Allanite, in honour of Mr Allan. Thomson 

 found it to contain, of silica 35.1, oxide of cerium 33.9, black 

 oxide of iron 25.1, lime 9.2, alumina 4.1, volatile substances 

 4.0, = 112.0. The imperfection of this analysis, shewn by 

 the excess of the constituent parts, rendered a repetition of 

 it desirable. Fortunately the Allanite has been again analyzed 

 by the celebrated Stromeyer, who gives the following as the 

 result of his analysis: Silica 3S.021, alumina 15.226, pro- 

 toxide of cerium 21.600, protoxide of iron 15.101, protoxide 

 of manganese 0.404, lime 11.080, and water 3.000; = 99.432. 

 It follows from this analysis, that the Allanite, although in 

 composition nearly allied to the orthite of Berzelius, differs 

 from it in not containing yttria. It is still uncertain if the 

 Cerin of Haidinger is the same mineral as Allanite; and it is 

 equally doubtful if the mineral from the Mysore, analyzed by 

 Wollaston, belongs to the Allanite species. 



9. Needle Ore, — This was first analyzed by John, who proved 

 that it was not, as had been previously supposed, an ore of 

 chrome, but a combination chiefly of bismuth, lead, copper, and 

 sulphur, in which the proportions were as follows : Bismuth 

 43.20, lead 24.32, copper 12.10, nicT<el 1.58, tellurium 1.32, 

 sulphur 11.58, loss 5.90; = 100.00. In a late analysis of this 

 ore by Hermann Frick, in Poggendorfs Annalen for 1834, the 

 nickel and tellurium (which, by the by, John had placed as 

 conjectural substances) were not found. After repeated analy- 

 ses, he gives the following as the composition of this ore : Sul- 

 phur 16.61, bismuth 36.45, lead 36.05, copper 10.59 ; = 99.70. 

 The formula of composition, 



CopBi+2PbBi. 



10. Platina and Gold of the Uraltan Mountains. — It would 

 appear, from some late investigations, that the platina occurs in 



