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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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Obsidian

Structure : Amorphous
Hardness : 5
Specific Gravity : 2.35
Refractive index : 1.48 - 1.5
Doubly Refracting (bi-refraction) : none

 
 
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