PHYSIOGRAPHY. 89 



Bronzite. 



Lustre metallic pearly upon P; for the rest, low degrees 

 of an imperfectly vitreous lustre. Color dirty shades of leek 

 green and blackish green ; also liver-brown, hair-brown and 

 clove-brown, greenish and ash-grey. These colors are 

 heightened by a metalloidal appearance upon P, "and often 

 incline to pinchbeck-brown. Streak corresponding to the 

 color. Translucent, sometimes only on the edges. 



Rather sectile. Hardness = 4'0 . . . 5-0. Sp. gr. = 

 3-251, a brown variety from Bayreuth. 



Compound Varieties. Massive : composition granular, 

 of various sizes of individuals, strongly connected. 



1. By the action of fire it assumes a lighter color, and loses its water ; 

 but is by itself infusible before the blow-pipe. 



2. Analysis. 

 By KOHLER. 



From Stempel near Marburg. Ulten Valley, Tyrol. 



Silica . . 57 193 .... 56-813 



Magnesia . . 32-669 .... 29677 



Lime . . 1-299 .... 2-195 



Protoxide of iron 7-4(>l .... 8-464 



Protoxide of manganese 0-349 .... 0-616 



Alumina . . 0698 .... 2-068 



Water . . 631 .... 217 



3. Bronzite is found in imbedded crystalline particles, either simple or 

 compound, in serpentine and greenstone rocks. It sometimes presents 

 itself in beds in the serpentine formation, mingled with massive Horn- 

 blende. 



4. It is found in considerable quantity in and near the Gulsen moun- 

 tain, in the vicinity of Kraubat in Stiria, where it forms beds in serpen- 

 tine. It occurs near Hof in Bayreuth, and probably at the Baste in the 

 Hartz, in the Bacher mountain in Lower Stiria, near Marburg, the Ul- 

 ten Valley in the Tyrol, at Lizard district in Cornwall, and in various 

 other countries. 



A variety of this species has been discovered within a few years at 

 Amity, in Orange county, (N.Y.) It occurs in limestone beds, which 



8* 



