Natural Prehnite - Rough - collectible or decorative - 4.9x4.1 cm - AKA Karoo Stone

Natural Prehnite - Rough - collectible or decorative - 4.9x4.1 cm - AKA Karoo Stone

Certificate : RO-PREH026GR-003-242

Gem Type: Prehnite

Shape: Rough

Size: 49.3 x 40.1 x 23.9 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