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.