ORDER vi. PRISM ATOI DAL SCHILLER-SPAR. 209 



Silica 60-00. 



Magnesia 27-50. 



Oxide of Iron 10-50. 



Water 0-50. 



By the action of fire it assumes a lighter colour, and loses 

 its water, but is by itself infusible before the blowpipe. 



2. The varieties of this species occur in imbedded crys- 

 talline particles, either simple or compound, in serpentine 

 and greenstone rocks. There are even beds included in the 

 serpentine formation, which consist almost entirely of 

 hemi-prismatic Schiller-spar, and are mixed with compound 

 varieties of hemi-prismatic Augite-spar. It is often associ- 

 ated with those species which are commonly found in ser- 

 pentine rocks. 



3. It is found in considerable quantities, in and near the 

 Gulsen mountain, in the vicinity of Kraubat in Stiria, 

 where it forms those beds in serpentine, of considerable ex- 

 tent, alluded to above. It occurs near Hof in Bayreuth, 

 at the Baste in the Hartz in green-stone, in the Bacher 

 mountain in Lower Stiria, and the Lizard district of Corn- 

 wall in serpentine, and under similar circumstances in va- 

 rious other countries. 



3. PRISMATOIDAL SCHILLER-SPAR. 



Hypersthene or Labrador Schiller-Spar. JAM. Syst. 

 VoL II. p. 178. Prismatoidal Schiller-spar or Hy- 

 persthene. Man. p. 132. Hypersthene. PHILL. p. 70. 

 Paulit. WEEN. Hoffm. H. B. II. 2. S. 143. Hy. 

 persthen. HAIJSM. II. S. 718. Hypersthen. LEONH. 

 S. 519. Diallage metalloide. HAUY. Traite', T. III. 

 p. 127. Hypersthene. Tabl. comp. p. 44. Trait** 

 2de Ed. T. II. p. 447. 



Fundamental form. Scalene four-sided pyramid of 

 unknown dimensions. The simple forms and 

 the character of the combinations are also un- 

 known. 



VOL. II. O 



