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Sulphur
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Rare sulphur dominates the deep

A form of sulphur rarely seen on Earth's surface, similar to that which gives the mineral lapis lazuli its deep-blue colour, may be the predominant form of the element in Earth's lower crust and upper mantle.
Known as the trisulphur ion, or S3-, it is quite different from the better-known sulphate (S6+) and sulphide, S2- sulphur ions.



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