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Assuming iodine is what you are after, as a solid it is a lustrous blue black crystal.

In the gas form it is a purple violet colour.

It is an essential element in diet, and low levels cause enlargement of the Thyroid gland (Goitre), and contributes to mental retardation. It is probably the heaviest element essential in diet. The mother concentrates iodine in breast milk, so perhaps it is needed more in infancy?

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