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minerals | nature | guess from a photo

Depending on its color, this mineral has a different name. When it is red it is ruby, and when it is blue it is sapphire.

Depending on its color, this mineral has a different name. When it is red it is ruby, and when it is blue it is sapphire.

corundum

Question of quiz:
Quiz: Can You Guess a Mineral from a Picture?

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