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


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E-Mail: gri@gemresources.com
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Prase ( Chalcedony )

Structure : Trigonal
Hardness : 7
Specific Gravity : 2.61
Refractive index : 1.53 - 1.5
Doubly Refracting (bi-refraction) : 0.004

 
 
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