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Gem Resources International
Gem Resources
PO Box 62006
Minneapolis, MN 55426

Phone: (612) 664-0252
Toll-Free: (800) 588-8515
E-Mail: gri@gemresources.com
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Nephrite ( Jade)

Structure : Monoclinic
Hardness : 6.5
Specific Gravity : 2.96
Refractive index : 1.61 - 1.6
Doubly Refracting (bi-refraction) : 0.027

 
 
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