4 



Mineralogical Notices. 219 



the author acknowledges that some doubt exists with regard to 

 this term in the formula. Dried at 100^ C. in a moist air, the 7S 

 (obtained after drying at 16^ C.) are reduced to 4fl; and at 100^ 

 G. in a dry air, to 3fi. 



The Smectite is greenish, not homogeneous in appearance^ and 

 affords a maama of two substances, one colorless and the other 



shghtly greenish, but both of the same composition; and the 

 V mass encloses here and there crystals of gypsum. In a certain 



state of humidity it appears transparent and almost gelatinous. 

 It adheres strongly to the tongue. Moistened with water it 

 yields an argillaceous odor and acts like Halloysite, except that 

 it makes a plastic paste. It contains 7^fl, when dried at 16^ C, 

 5i, if dried at 100^ in a moist atmosphere^ and 4| at 100^ in a 

 dry atmosphere. 



The Lenzinite occurs in pegmatite (whence it is explored for 

 pottery) in small thin beds, having a brownish color, soft enough 

 to be impressed with the fingers, but not plastic. On drying, the 

 color slightly changes. B.B. infusible. Partly dissolved in hot 

 sulphuric acid, leaving a white insoluble residue. At 100^ C, 

 i; the mineral contains 2^fi. 



Atheriastite. — ^J, F. L. Hausmann shows (Pogg. Ann., Ixxxi, 

 567,) that this mineral which was formerly referred to Scapolite, 

 but recently instituted as a species by Wei'bye, is an altered scap- 

 olite, as is suggested by the writer in this Journal^ vol. x, p. 246. 



Feldspar of Laiirvig and Friederichsvarn. — Analysis by C. G. 

 Omelin, (Pogg. Ann., Ixxxi, 313,) 



Si Si K S-a Ca Pe 



i. Laurvig, 65-90 19-46 6 55 6-14 0-23 0-44, ign. 012= 9889; G. =2-5372 



•^. Fnederichsvarn, 65*19 1999 703 708 048 0-63, '* 0-38=]00- 78 ; G. =2-590 



The first is of a pale greenish gray color, the second sky-blue. 



Epidote, — The objections which Rammelsberg brought against 

 the investigations of Hermann on the constitution of Epidote, are 

 replied to by Hermann in the Jour. f. pr Chem., vol. liv, p. 250. 

 Hermann had in a former memoir presented the conclusion that 

 the species inckided several distinct chemical compounds. Ram- 

 melsberg, in reply, after a new determination of the proportion of 

 protoxyd and peroxyd of iron, referred all the varieties which he 

 examined under a single formula, and suggested that the others 

 Would conform to it. Hermann in his recent memoir offers rea- 

 sons in favor of his former deductions- 



Gadoljnite, (Phil. Mag. [4], i, 350.)— Occurs in Ireland near 

 Gahvay in a trap rock containing also epidote. 



New American localities, reported by Prof. C. U. Shepard. 

 (Joe, cit., p. 320.) 1. Ores of Uranium at Middletown, CL 

 Pitchblende occurs at the feldspar or ^'china-stone" quarry in 

 small crystals which are octahedrons with truncated edges and 



*T 



