No. 76.] 



133 



HYPERSTHENE, 

 (Mineralogy of New- York, page 309.) 



Damour has published an analysis of a specimen of this mineral, from 

 Labrador; the following are the results: Silica, 51 "36 ; protoxide of 

 iron, 21-27; magnesia, 21*31 ; lime, 3*09; protoxide of manganese, 

 1-30; alumina, 0-37. Phil. Mag., April, 1845. 



A specimen from Orange county, known by the name of hypersthene, 

 is foliated, has a brownish color, and is not unlike feldspar in its ap- 

 pearance. Upon analysis it was found to contain the following ingre- 

 dients, viz: Silica, 59*50; oxide of iron, 12*00; magnesia, 27 -75; (not 

 a trace of lime.) In composition this mineral is almost indentical with 

 Klaproth's bronzite, the hemiprismatic schiller spar of Jameson, {Man. 

 of Mineralogy, p. 166,) and with the anthophyllite of Thompson, (Out- 

 lines of Miiierology, <^c., ii., p. 206.) Some obscurity, therefore, still 

 rests upon this species. As before stated, Dana unites hypersthene 

 with pyroxene ; but this, it seems to me, is scarcely allowable in the 

 present state of our knowledge. 



SPINELLE. 



(Mineralogy of New- York, page 315.) 



To the localities of this interesting mineral heretofore given, maybe 

 added its occurrence in Schroon, Essex county, in pink-colored crystals. 

 {Enwions^ Rep. on the Geol. 2d Dist., p. 227.) I have also received 

 regular octahedrons of spinelle, having a black color, from Carmel, in 

 Putnam county. 



I must again refer to the paper of Dr. Blum, on pseudomorphous 

 minerals, [Sill. Jour., xlviii., p. 73,) for a notice of the soft spinellcs 

 described in my report, (p. 318.) 



AUTOMALITE. 



(Mineralogy of New-York, page 319.) 



In regard to this mineral, whose existence as a New- York species is 

 very doubtful, I have to state that recent examinations have rendered it 

 probable that it is identical with dysluite. The two minerals pass into 

 each other, and the diflference in hardness, color, specific gravity, &c., 

 can thus be accounted for by the well known fact of the isomorphous 

 replacement of the constituents of certain minerals, the crystalline forms 

 of which remain the same. See Memoirs JBost. JNcit. Hist, Soc. ii. p. 88 



