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Reference Values of Gems
Database updated: 15 Jan 2017
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Andesine

  • Color: Red, Orangey Red, Orange, Yellow, color shift to Green
  • Hardness: 6 - 6.5
  • Refractive index: 1.55 - 1.56
  • Density: 2.66 - 2.70
  • Chemical composition: (Na,Ca)(Si,Al)4O8
  • Crystal structure: triclinic 
  • Origins: Congo, Tibet.

Andesine belongs to the group - plagioclase feldspar. The red color is due to the presence of copper and is rare in gem quality stones. The best specimens are from Congo, with cherry-red and orangey-red crystals the most valuable.

  

 


Market values of Andesine  

Occurrence of Andesine  

Historical values  


 
 
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