434 



Scientific Intelligence. 



which is the formula of lime-iron garnet, a mineral with which it is 

 associated. H = 6. G = 3-807. With the fluxes before the blowpipe, 

 it affords beads colored with iron, and with soda a trace of manganese. 

 The salt of phosphorus bead gives in the reducing flame the charac- 

 teristic color of titanium, which is more distinct on the addition of tin. 



Mr. Whitney proposes the new name ferrotitanite for the species, 

 on the ground of an error in Prof. Shepard's analysis. But although 

 there may be some reason for the change, the principle involved, if 

 carried out with regard to the names of minerals generally, would 

 create endless confusion in the science. 



Ozarkite occurs only as a thin amorphous coating on elsaeolite. Ac- 

 cording to Prof. Shepard, it appears to be fcfc a siliceous hydrate of lime 

 and yttria, possibly also having traces of thorina." 



Mr. Whitney states that a portion of the mineral as pure as could be 

 separated, fused easily before the blowpipe, intumescing slightly like a 

 zeolite and having a tendency to swell up with vermicular contortions 

 like.mesotype or scolecite. It also colored the flame yellow. It read- 



ily dissolved in acids to a clear liquid, and a quantitative examination 

 showed it to be a hydrous silicate of alumina and lime, with a little 

 soda, indicating, in connection with other characters, that it is probably 

 a lime-mesotype or scolecite. 



4. Chemical Examination of some Minerals; by J. D. Whitney, 

 (Jour. Bost. Soc. Nat. Hist., 1849, p. 36.) — Nemalite.— This mineral 

 is shown by the analysis of Mr. Whitney to be a fibrous variety of the 

 hydrate of magnesia or Brucite. It afforded him magnesia 62*89, prot- 

 oxyd of iron 465, carbonic acid 4*10, water 28*36. A small portion of 

 magnesia is replaced by protoxyd of iron. The formula of Brucite 



* 



(Mg H) requires magnesia 69*67, water 30*33. 



ConnePs recent analysis* is erroneous from the impurity of his spec- 

 imen, in including a considerable proportion of carbonate of magnesia. 



Coracite of Le Conte.t — An analysis of this mineral afforded: 

 silica 4*35, alumina 0-90, oxyd of iron 2*24, oxyd of uranium 59*30, 

 oxyd of lead 5*36, lime 14*44, carbonic acid 7*47, water 4*64, mag- 



98*70. Mr. Whitney considers the 



itch- 



nesia and manganese in traces 



the 



• » • 



uranium in tne mineral as U" (and notUXJ as in common p 

 blende) in consequence of its ready solubility in acids. The mineral 

 occurs amorphous, with an uneven fracture and no trace of cleavage. 

 Hardness a= 3. Color pitch-black. Powder grey. Lustre resinous. 

 Before the blowpipe it does not change its appearance or color the 

 flame. With the fluxes it gives the characteristic reactions of uranium. 

 In dilute muriatic acid it dissolves readily without heat, effervescing 

 strongly, while pitchblende is insoluble except in nitric acid or aqua re- 

 gia. The solution has a fine green color and contains a little flocky silica. 

 Peclolite and Ste/lite. — Pectolite occurs in Isle Royaie, Lake Supe- 

 rior, in spheroidal masses, consisting of delicate silky fibres radiating 

 from a centre, resembling foreign specimens from Monte Baldo. The 

 stellite of Bergen Hill, New Jersey, analyzed by Beck, has the exter- 

 nal characters of Pectolite, and also as Mr. Whitney shows, its com- 

 position. The following are the results of four analyses : 



this Journal, 



f See this Journal, hi, 173, 1847 



