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Andalusite

Andalusite var. Chiastolite.

Gemological Information for Andalusite

  
Color:Brownish to Yellowish Green, Green, Brown, rarely Pink
Crystal Structure:Orthorhombic
Refractive Index:1.6345 – 1.643
Durability:Fair to Good
Hardness:7 to 7.5
Family:Chiastolite – Features a Cross Pattern
Similar Stones:Tourmaline, Topaz, Barite, Apatite, Danburite, Chrysoberyl
Treatments:Heat Treatment
Country of Origin:Brazil, Sri Lanka

Andalusite Care

  
Ultrasonic Cleaning:Use Caution
Steam Cleaning:Risky
Warm Soapy Water:Safe
Chemical Attack:None
Light Sensitivity:Stable
Heat Sensitivity:Check for Liquid Inclusions

More Information

Gems & Gemology: The Quarterly Journal of the Gemological Institute of America

 

G&G Article Index: Andalusite

  • Winter 1948, An 85 ct. Rough Andalusite Believed to be One of the Finest, p. 124, 2pp.
  • Winter 1960, A 32 ct. and a 20 ct. Flawless Cut Andalusite (Showing Absorption Spectrum), p. 121, 1p.
  • Summer 1961, The Andalusite Absorption Spectrum, p. 185, 2pp.
  • Fall 1976, Inclusions in Brazilian Andalusite, p. 201, 2pp.
  • Winter 1980, Inclusions in Andalusite – A Comparison of Localities, by John I. Koivula, p. 401, 4pp.