Which is more stable compound?
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Among all the crystalline forms of the compound, the alpha-alumina (corundum) is the most stable. When includes compounds that makes it colored this mineral is known as Ruby (Cr2O3 presence) or Sapphire (Fe2O3 and TiO2 presence).
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Among all the crystalline forms of the compound, the alpha-alumina (corundum) is the most stable. When includes compounds that makes it colored this mineral is known as Ruby (Cr2O3 presence) or Sapphire (Fe2O3 and TiO2 presence).
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