polycrystalline mineral in the garnet group that occurs in a green or pink color, sometimes intergrown with idocrase. Bright green samples are sometimes used as a jade simulant.

Watermelon Hydrogrossular.

Gemological Information for Hydrogrossular Garnet

Color:Green, Bluish Green, Gray, White & Pink
Crystal Structure:Cubic
Refractive Index:1.72 (+.010-.050)
Similar Stones:Idocrase, Jadeite, Nephrite, Saussurite, Rhodonite, Unakite
Treatments:None Known at this Time
Country of Origin:Green & Pink – U.S., Canada & South Africa, White – Myanmar & China

Hydrogrossular Garnet Care

Ultrasonic Cleaning:Safe
Steam Cleaning:Safe
Warm Soapy Water:Safe
Chemical Attack:Slight Hydrofluoric Acid Reaction
Light Sensitivity:Stable
Heat Sensitivity:Fractures with Extreme Heat