Vesuvianite aka Idocrase.

Vesuvianite aka Idocrase.
Photo Courtesy of Rob Lavinsky,


Idocrase is mineral species known as Vesuvianite and has several varieties. Sometimes erroneously referred to as “California Jade.”

  • Californite – Mottled or Veined Green to Yellowish Brown
  • Xanthite – Transparent Yellow to Yellowish Bro

Gemological Information for Idocrase

Color:Yellow Green, Bluish Green, Gray, White & Brown
Crystal Structure:Tetragonal
Refractive Index:1.713 – 1.718
Durability:Fair to Good
Similar Stones:Jadeite, Nephrite, Hydrogrossular, Spinel, Epidote, Kyanite, Zoisite
Treatments:None Known at this Time
Country of Origin:U.S., Canada, Russia, Italy, Norway and the Alps

Idocrase Care

Ultrasonic Cleaning:Risky
Steam Cleaning:Not Safe
Warm Soapy Water:Safe
Chemical Attack:Attacked by Acid
Light Sensitivity:Stable
Heat Sensitivity:Fuses with Heat