Chalcedonies include many types of cryptocrystalline ... surroundings showcase a ruby from Tanzania in its unpolished beauty. Rubies, valued as precious gems, are the mineral corundum in its ...
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Why are rubies red and emeralds green? Their colors come from the same metal in their atomic structureBoth rubies and emeralds are minerals, which is a type of rock with a consistent chemical ... aluminum in the corundum or beryl crystal when a ruby or emerald forms underground at a high ...
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