What's the difference between idocrase and vesuvianite?

Idocrase

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Definition:

• (n.) Same as Vesuvianite.

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Vesuvianite

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Definition:

• (n.) A mineral occurring in tetragonal crystals, and also massive, of a brown to green color, rarely sulphur yellow and blue. It is a silicate of alumina and lime with some iron magnesia, and is common at Vesuvius. Also called idocrase.

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