Natural Prehnite - Rough - lapidary, collectible or decorative - 6.6x6.4 cm - AKA Grape stone

Natural Prehnite - Rough - lapidary, collectible or decorative - 6.6x6.4 cm - AKA Grape stone

Certificate : RO-PREH026GR-003-245

Gem Type: Prehnite

Shape: Rough

Size: 66.9 x 64.9 x 28.1 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