Minerals
💎Corundum
Corundum Group
Aluminum oxide minerals. The second hardest natural substance after diamond (9 on the Mohs scale). Red corundum is ruby; all other colors are sapphire.
Source: Wikipedia💡Ruby and sapphire are the exact same mineral — just trace amounts of different elements give them their colors. Chromium makes red (ruby), iron and titanium make blue (sapphire).
4 minerals
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