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Ch. 6: Beryl (Emerald, Aquamarine), Chrysoberyl, Phenacite, & Euclase

Ch. 5: Garnets - Essonite, Spessartite, Almandite, Pyrope, Ouvarovite, & Schorlomite Page of 364 Ch. 6: Beryl (Emerald, Aquamarine), Chrysoberyl, Phenacite, & Euclase Text size:minus plus Restore normal size   Mail page  Print this page
     
     
 
 
 
 
  
 
CHAPTER VI.
  
 
 
  
 
 
 
 
  
 
Beryl (Emerald.Aquamarine), Chrysoberyl, Phenacite, and Euclase.
  
 
 
  
 
 
 
 
  
 
T HE emerald and aquamarine are mineralogically in­cluded in the species of beryl. Their difference in color is due to slight traces of other compounds. They crystallize in the rhombohedral system, almost always in six-sided prisms. The specific gravity of the transparent beryl is very nearly 2.7, the hardness of the aquamarine being 8 and the emerald variety about 7.8. The emeralds from Muso are less hard than the aquamarine from Siberia. They are also found in Takowaja, Siberia, and at Zabara, near the Red Sea, in upper Egypt, and in Habachthal, Tyrol. This latter locality evidently furnished some of the material used in ancient Rome. The finest emeralds are found in isolated crystals and in geodes with calcite quartz, iron pyrites, and parfsite, and in a clay slate rock contain­ing fossiliferous limestone concretions, at the Muso Mine, near Santa Fe de Bogota, New Grenada. Fine blue and green beryls are found in Brazil, Hindoostan, Ceylon, and in the mica schist of the right bank of the Takowaja River, Ekatharinenburg, Siberia. The emerald variety of beryl is among the most remarkable of American gem minerals. In Alexander County, N. C, emeralds, or beryls suggesting them, have been found at five different points, with quartz, rutile (some of the finest ever found), dolomite, mus-covite, garnet, apatite, pyrite, etc., all in fine crystals. One of these localities, Stony Point, is about thirty-five miles southeast
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Ch. 5: Garnets - Essonite, Spessartite, Almandite, Pyrope, Ouvarovite, & Schorlomite Page of 364 Ch. 6: Beryl (Emerald, Aquamarine), Chrysoberyl, Phenacite, & Euclase
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