Gemological information

Gemological Information for Chlorastrolite
Color Mottled light and dark green with a radial fibrous structure.
Crystal Structure Monoclinic
Refractive Index 1.650 to 1.660
Durability Fair
Hardness 5 to 6
Similar Stones Malachite, Azurmalachite, Dyed Onyx, Jade
Treatments None
Country of Origin U.S.
Chlorastrolite Care
Ultrasonic Cleaning Risky
Steam Cleaning Risky
Warm Soapy Water Safe
Chemical Attack Attacked by Acid
Light Sensitivity Can Lighten with Long Exposure to Sunlight.
Heat Sensitivity Unknown


Gem Reference Guide, Los Angeles: Gemological Institute of America, 1988. Pp. 49-50.