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Well, actually, ivory is the substance (dentine) that forms the tusks of tusked mammals (such as elephants, certain whales, etc.). While it is formed of minerals, it takes the circuitous route of being in plants, eaten and digested before becoming ivory on a living animal.

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If you are looking for the suggestion of combining, mixing or comparing the colors ivory and ebony, Nanaea's suggestion (onyx) is excellent.