1824.] Scientific Notices— Mineralogy. 391 



affords a new proof of the superiority of the chemical over the 

 external characters of minerals, for many other ores, as, for 

 example, those which are usually styled nickel ochre, zinc ochre, 

 black copper, most of the oxides of manganese, &c. are in a 

 similar situation, not one of them being pure oxides. — (Schweig- 

 ger and Meinecke's Jahrbuch der Chemie und Physik, ii. 245.) 



11. Notice of the Lenzinite from the Neighbourhood of Saint-' 



Sever. 

 This mineral differs extremely in its appearance ; it is most 

 commonly met with in amorphous masses, from the size of the 

 fist to that of the head : it is much lighter than limestone, and 

 covered externally with a yellowish brown coating of oxide of 

 iron. Internally, it is of a fine dead white, opaque, homogene- 

 ous, compact ; of a tine grain, and soft and soapy to the touch ; 

 it is susceptible of being polished by rubbing with the finger. 

 It adheres strongly to the tongue, and may be cut with the 

 knife; but is sufficiently brittle to break under the hammer into 

 sharp angular pieces. Its fracture is dull, and often conchoidal. 

 When dipped in water, and then held near the ear, it crackles 

 remarkably, but does not split, like the argillaceous lermnite of 

 John. It gives no effervescence with acids, becomes hardened 

 by fire, but not sufficiently so, to scratch glass. 

 According to Pelletier's analysis, it consists of 



Silica 50 



Alumina 22 



Water 26 



Loss ^ 



Too 



In its external appearance, it has much resemblance to the 

 compact carbonate of magnesia. 



M. Leon Dufour describes three varieties of this mineral.— 

 (Annales des Sciences Naturelles.) 



12. American Localities of some Minerals. 



Mr. Shepard has found, what he considers as i/enite, at Cum- 

 berland (R. I.); at Chesterfield, fine specimens of green feldspar 

 and siliceous oxide of manganese, containing occasionally small 

 octohedral crystals of magnetic iron. These two were found 

 near the spot where the sappare is obtained. 



Beautiful green feldspar lias been recently found at Beverley 

 (Massachusets), by the Rev. Elias Cornelius j small portions 

 of purple fluor are disseminated in its fissures. 



Mr. Jacob Porter gives the following localities : — 



Calcareous tufa, exhibiting impressions of vegetables, has been 

 found at Semphronius, New York. 



