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The chemical formula for 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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Hagrid
The right answer for the question that is being asked and shown above is that: "a pure substance because it is a compound." The chemical formula for emerald is Be3Al2(SiO3)6. An emerald can be described as a pure substance because it is a compound.
Dejanras

Answer is: a pure substance because it is a compound.

Pure substance is made of only one type of atom or only one type of molecule, it has definite and constant composition with distinct chemical properties.

Emerald (beryl) is chemical compound (beryllium aluminium cyclosilicate) with the chemical formula Be₃Al₂(SiO₃)₆.  Pure beryl is colorless.

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