neil cohen, gemologist appraiser, connecticut

 

 

 

 

Smokey (Quartz)

 

Color: Smokey grey, yellow to peach tint


Moh’s Hardness: 7


Refractive Index: 1.544-1.553


Critical Angle: 40.49°


Specific Gravity: 2.63-2.65


Cleavage: None


Fracture: Conchoidal


Dispersion: Medium (.013)


Heat Sensitivity: Can be... but is usually not a problem


Dichroism: none


Birefringence (double refraction): Weak (.009)


Crystal structure: Hexagonal

 

Treatments: Generally none... Some material is irradiated from clear Quartz. Some material is heated lighter.

 

 

 

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