Natural Prehnite - Rough - lapidary, collectible or decorative - 7.3x5.0 cm - AKA Grape stone

Natural Prehnite - Rough - lapidary, collectible or decorative - 7.3x5.0 cm - AKA Grape stone

Certificate : RO-PREH026GR-003-246

Gem Type: Prehnite

Shape: Rough

Size: 73.8 x 55.0 x 36.3 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