PHYSIOGRAPHY. 



Schiller-Spar Selencuprite. 



Lustre, metallic pearly, eminently so upon the perfect 

 faces- of cleavage ; indistinctly vitreous upon the other faces. 

 Color olive-green and blackish green, inclining to pinch- 

 beck-brown upon the perfect faces of cleavage. Streak 

 greyish white, inclining a little to yellow. Translucent on 

 the edges. 



Rather sectile. Hardness = 3-5 ... 4-0. Sp. gr. = 



2-692. 



Compound Varieties. Massive : composition granular, 

 of various sizes of individuals. The individuals are often 

 intermingled with Serpentine. 



1. Exposed to* high degree of heat, it hardens into a porcelainous 



mass. 



2. Analysis. 



By HEYER. By VAUQUELIN. By DRAPPIER. 



Silica . 52-00 ,. 62-00 .... 41-00 



Magnesia . 600 . 10-00 .... 29 C 



Alumina - 23-33 . 13 00 .... 



Lime . 7-00 . 0-00 .... 



Oxide of iron 17-50 .{JS 



Water . 0-00 . 00 .... 10-00 



3. The varieties of Schiller-Spar occur imbedded in simple and com- 

 pound crystalline masses in serpentine, with which they are mixed. The 

 only locality in Europe, which can be quoted with certainty, is the 

 Baste in the forest of Harzgeburg in the Hartz. It is found of a black- 

 ish color, with Serpentine and Kerolite, at Blandford, (Mass.) 



SCHORL. (See Tourmaline.) 



SCOLEZITE. (See Mesotype.) 



SELENCUPRITE. Selencupreous Polypoione- 

 Glance. 



Massive : composition impalpable. 



Lustre metallic. Color silver-white. Streak shining. 

 Ductile ? 



