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Why are rubies red and emeralds green? Their colors come from the same metal in their atomic structure
Pure corundum and beryl are colorless. The brilliant colors of rubies and emeralds come from the presence of very small amounts of chromium. The chromium replaces about 1% of the aluminum in the ...
National Geographic news7y
Minerals and Gems
Rubies are formed of a mineral called corundum, comprised of aluminum oxide. The red color is caused by traces of chromium. Corundum also forms sapphire in many colors, which generally come from ...
Atlanta Journal-Constitution25d
Why are rubies red? Chemistry.
Pure corundum and beryl are colorless. The brilliant colors of rubies and emeralds come from the presence of very small amounts of chromium. The chromium replaces about 1% of the aluminum in the ...