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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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Cassiterite

Hardness : 6.5
Specific Gravity : 6.95
Refractive index : 2.00 - 2.1
Doubly Refracting (bi-refraction) : 0.1

 
 
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