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Gemstone  : Natural scapolite 

Treatment  :  Not Heated. Not Treated.

Description

The scapolites are a group of rock-forming silicate minerals composed of aluminium, calcium, and sodium silicate with chlorine, carbonate and sulfate. The two endmembers are meionite and marialite. Silvialite (Ca, Na)₄Al₆Si₆O₂₄ is also a recognized member of the group. Wikipedia

Color: White, Purple, Yellow, Pink, Brown, Orange

Luster: Vitreous

Crystal system: Tetragonal crystal system

Chemical formula: (Na,Ca)₄(Al,Si)₃Si₆O₂₄ )(Cl,CO₃)

Hardness (Mohs hardness scale): 5 – 6

Transparency: Opaque, Transparent

Refractive index: 1.54 – 1.58