Natural Prehnite - Rough - highly decorative - 6.5x6.8 cm - AKA Grape stone

Natural Prehnite - Rough - highly decorative - 6.5x6.8 cm - AKA Grape stone

Certificate : RO-PREH026GR-003-248

Gem Type: Prehnite

Shape: Rough

Size: 65.8 x 68.9 x 40.5 mm.

Color: clear green

Clarity: Semi-Translucent

Luster: N/A

Treatment: Unheated Untreated

Birefringence : 0.021-0.033
Crystallography : Orthorhombic
Dispersion : weak
Luster : Vitreous
Hardness : 6-6.5
Refractive index : 1.611-1.665
Specific gravity : 2.80-3.00

COMMENTS :

No indications of heating, no indications of any other treatment

FIND THE ONLINE CERTIFICATE HERE