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Blood-red
corundum is called ruby and is the rarest and most valuable gemstone.
All other gem-quality corundum is called sapphire. |
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M603 - Sapphire specimens from Madagascar.
Aluminum oxide.
Hardness 9. Hexagonal, sometimes tapering prismatic crystals. Blue
Corundum Sapphire crystals. Crystals range in size from about 1" to
1-1/2". Good polish on one end to show the sapphire color and structure.
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