J 



218 Mineralogical Notices, 



and Hermann 12'5 percent. He therefore suggests that quite 

 probably the mineral may exist in the unaltered state and prove 

 to be a distinct species. 



Delessite of Naumann, is a ferruginous chlorite from amyg- 

 daloid. 



Ozarkite, — On an examination of this mineral. Prof Shepard 

 obtained the following result (Proc. Assoc, loc. cit., p. 322.) 

 Si 40-91, Si 15-75, phos. hme 4-173 li^ne 4'52j water IS'IO^ and 

 observes that this removes the mineral from Scolecite, to which 

 it is referred by Mr. J. D. Whitney. [The investigations of the 

 species by Messrs. Brush, Whitney and Shepard, the latter in two 

 different trials, are so widely different, that we have not reason to 

 believe that in any case a shnple mineral has been examined.] 



Soda-mesotype of the Zircon-syeniie of Latirvig. — Analysis 

 by C. G. Gmelin (Pogg. Ann., Ixxxi, 311): 



Si Si Xa K fl 



48-680 , 26-369 16-002 20-362 9-550 =100-958 ; G.= 2-207 



Hence the formula XaSi + SlSi+2B:. It gelatinizes with muriatic 

 acid, before and after heating. The feldspar of the rock contains 



much soda. 



Hydrosilicates of Alumina. — The following are analyses by < 



M. Salvetat : — I. of Halloysite from Saint Jean de Colle, near | 



Thiviers (Dordogne,) — II. Halloysite of unknown locality^ — HI. 

 of Smectite from Conde, near Houdan (Seine-et-Oise,) — IV. Len- 

 zinite from LaVilate, near Chanteloube, (Ann. Ch. Phys. [3], 

 xxxi, 102. ) 



Si SigeL 3^1 Pe Ca 1i^ t^ ]Nfa fl 

 L H. from 



St JdeC H^'^^ ^'^"^ --'^^ 1"^^ 1'^^ 0-30 0-04 0*06 26*20, q'tzl-04=99-46 

 OxTgen 23-60 10-55 0-32 0-46 0-12 O'Ol O'Ol 23*28 



II if., loc! 45*44 2400 1-35 0'83 0*09 0-93 26*70=99*35 



Oxygen 2360 11'21 0*41 23*93 



in. Smectite A^-m 1*50 32-50 f'el'iO 1*02 030 0*40 21*70 = 101-62 

 Oxygen 2234 1518 19-08 



TV , Lenzhiite Z^'U 20 36-003Pel-95 0*18 O'SO 21*50,q'tzl'64=100*13 



Oxygen 18-89 16-82 0-61 19-02 



Formulas, omitting the protoxyds which are probably impurities, 



Landll ESi2+7fi III. 3tl2 Si3 -j- 7^3 IV. iiSi + sfl. 



The Halloysite from near Thiviers is tender, soapy and mild 

 to the touch, of paler rose color than that of Montmorillon. B-B. 

 infusible, and at a red heat loses color. Does not form a paste 

 with water. In contact with water it divides into small frag- 

 ments, and gives out bubbles of air with an argillaceous odor. 

 Boiling sulphuric acid attacks the mineral. The second Halloy- 

 site has similar characters. On account of the difficulty of dis- 

 tinguishing between hygroscopic water and that of combination, 



£ 



