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Reference Values of Gems
Database updated: 15 Jan 2017
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Andalusite

  • Color: strongly pleochroic, reddish brown, pink / yellowish green
  • Hardness: 7 - 7.5
  • Refractive index: 1.63 - 1.65
  • Density: 3.13 - 3.21
  • Chemical composition: Al2SiO5
  • Crystal structure: orthorhombic
  • Lustre: vitreous, greasy 
  • Origins: Spain, Brazil, USA, Sri Lanka, Burma.

Discovered in Andalusia (Spain), the andalusite stone is relatively rare, with big crystals over 10 ct. especially rare. Due to its remarkable pleochroism effect, the stone is highly valued by collectors.

 

Andalusite 1.46 cts.
Andalusite 1.46 cts.
Published under permission: Miguel Angel Lopez

 


Market values of Andalusite  

Occurrence of Andalusite  

Historical values  


 
 
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