neil cohen, gemologist appraiser, connecticut

 

 

 

 

Scapolite

 

Color: Yellow, purple, pink, colorless, greenish


Moh’s Hardness: 5-6


Refractive Index: 1.54-1.56


Critical Angle: 40.49°


Specific Gravity: 2.57-2.74


Cleavage: Perfect in 2 directions


Fracture: Conchoidal, brittle


Dispersion: Medium (.017)


Heat Sensitivity: Moderate


Dichroic: Moderate


Birefringence (double refraction): Weak to medium (.009-.020)


Crystal Structure: Tetragonal

 

Treatments: Generally none, but Purple may be irradiated and/or heat treated

 

 

 

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