ORDER VI. HEMI-PRISMATIC SCHILLER-SPAR. 207 



white, inclining a little to yellow. Translucent 

 on the edges. 



Rather sectile. Hardness = 3-5 ... 40. Sp. Gr. 

 = 2-692, the variety from the Baste in the Hartz. 



Compound Varieties. Massive : composition 

 granular, of various sizes of individuals. The in- 

 dividuals are often as if interlarded with ser- 

 pentine. 



OBSERVATIONS. 



1. The diatomous Schiller-spar consists of 



Silica 52-00 62-00 41-00. 



Magnesia 6-00 10-00 29-00. 



Alumina 23-33 13-00 3-00. 



Lime 7'00 0-00 1-00. 



Oxide of Iron 17'50 1300 14-00. 



and manganese. 



Water 0-00 0-00 10-00. 



HEYER. VAUQUELIJT. DHAPPIER. 

 If exposed to a high degree of heat, it becomes hard, and 

 forms a porcelain-like mass. 



2. The varieties of the present species occur in imbedded 

 simple and compound crystalline masses in serpentine, with 

 which they are mixed ; and the only locality of them, which 

 can be indicated with certainty, is the Baste in the forest 

 of Harzeburg in the Hartz. All the other localities men- 

 tioned for this species are uncertain, as it has not hitherto 

 been sufficiently distinguished from the hemi-prismatic 

 Schiller-spar. 



2. HEMI-PRISMATIC SCHILLER- SPAR. 



Schiller-Spar (Bronzite). JAM. Syst. Vol. II. p. 175. 

 Hemi-prismatic Schiller-Spar, or Bronzite. Man. p. 131. 

 Bronzite. Schiller-Spar (in part). PHILL. p. 25. 71 

 Blattriger Anthophyllit. WEUX. Hoffm. H. B. I. S.676. 

 Schillerstem ? Bronzit. HAUSM. II. S. 717. Bronzit, 



