Ruby (gemstone)/Definition: Difference between revisions

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A gemstone, typically nearly clear red, composed primarily of aluminum oxide (Al<sub>2</sub>O<sub>3</sub>), with chromium (Cr<sup>3+</sup>) substituting for some of the aluminum (Al<sup>3+</sup>) as an 'impurity'.
A gemstone, typically nearly clear red, composed primarily of aluminium oxide (Al<sub>2</sub>O<sub>3</sub>), with chromium (Cr<sup>3+</sup>) substituting for some of the aluminium (Al<sup>3+</sup>) as an 'impurity'.
 
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Ruby (gemstone) [r]: A gemstone, typically nearly clear red, composed primarily of aluminium oxide (Al2O3), with chromium (Cr3+) substituting for some of the aluminium (Al3+) as an 'impurity'.

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