Earth

What mineral makes both sapphires and rubies when cut and polished?

More Questions from Earth
Which of these is not a category of groundwater?
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In what month does a "Milk Moon" occur?
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Which of these pairs of elements was discovered before the 14th century?
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What does your body use to get rid of salt?
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Ruby and sapphire are gem forms of which mineral?
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Which of these is not a metamorphic rock?
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What are the features on the surface of the Earth called?
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Which of these is not a type of deep-sea sediment?
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