Intelligence and Miscellaneous Articles. 431 



This analysis, it is remarked, gives us the constituents of gadolinite 

 as follows : 1216 atoms silica 



8'OG — yttria 

 088 — protoxide of cerium 

 3*9 1 — glucina 

 3* — protoxide of iron. 



Were we to suppose the protoxide of iron to be an accidental in- 

 gredient, we might consider gadolinite as composed of 

 2 atoms silicate of yttria 

 1 atom silicate of glucina and cerium j 

 or we might consider it as composed of 



1 atom silicate of cerium 

 4 atoms silicate of glucina 

 8 atoms silicate of yttria. 

 If the protoxide of iron be an essential constituent, the oxide ot 

 cerium, glucina, and protoxide of iron must be in the state of disili- 

 cates. 



It is stated that benzoate of ammonia throws down glucina, which 

 benzoic acid does not ; and that, with care, the peroxide of iron may 

 be completely precipitated by benzoic acid. — Thomsons Records of 

 Science, vol. i. p. 408. 



RHODIZITE, A NEW MINERAL. 



M. Gustan Rose has discovered a new mineral, to which he has given 

 the name of Rhodizite, among the tourmalines of the Berlin Museum. 

 There is a good deal of analogy between it and the boracite j it has 

 the same form, hardness, and colour, and the phenomena accompany- 

 ing its fusion before the blowpipe, with borax, salt of phosphorus, fluor 

 spar and silicate of soda ; it also acts in the same manner on boracic 

 acid, and dissolves with difficulty in muriatic acid. Its peculiar cha- 

 racters are as follow : it colours at first the flame of the blowpipe 

 green, then green and red, and at last entirely red ; when put on 

 burning coals its edges are rounded ; it becomes white and then 

 opake, and is covered with excrescences as when it is heated with 

 the blowpipe ; fused with a small quantity of soda it forms a white 

 enamel -, and when the quantity of soda is considerable it produces a 

 transparent glass, which does not crystallize on cooling j lastly, when 

 it is dissolved in muriatic acid, and ammonia and oxalic acid are added 

 to it, a great quantity of precipitate is formed. It is found in granite; 

 and it adheres so strongly to the red tourmaline, that when separated 

 it has impressions of it. — Journal de Cliimie Me'dicale, October 1835. 



MR. SAULL S GEOLOGICAL COLLECTION. 



We are informed that Mr. W. D. Saul!, F.G.S., &c, having re- 

 cently erected a building to contain his Geological Specimens, in- 

 cluding also those that were in the collection of the late Mr. 

 Sowerby,is desirous of informing scientific gentlemen, and his friends 

 generally, that the entire collection is now stratigraphically ar- 

 ranged, and that the Museum is open for inspection every Thursday 

 morning, at Eleven, at his residence, No. 15, Aldersgate-street, City. 



October 20, 1835. 



