A manual of the mineral sciences

A manual of the mineral sciences

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Two of the most valuable gemstones, ruby and sapphire, are both of the same chemical composition. They are both corundum or aluminum oxide, with the only difference being in their color. The ruby is red and the sapphire is blue. In additionanbsp;...

Title:A manual of the mineral sciences
Author: Ray J. Holmquist
Publisher: - 1964

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