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The chemical formula for an emerald is Be3Al2(SiO3)6. An emerald can be described as
a pure substance because it is a compound.
a pure substance because it is an element.
an impure substance because it is chemically combined.
an impure substance because it is a mixture.

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a pure substance because it is a compound.

Explanation: Be3Al2(SiO3)6 is a chemical formula for the mineral beryl (emerald is a chromium/vanadium‑colored variety), so it is a compound — compounds are pure substances. (Note: natural emeralds often contain trace impurities and inclusions, but the substance itself is a compound.)