sulphur, native

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sulphur, native Non-metallic element, S; sp. gr. 2.0; hardness 2.0; yellow; massive, or tabular when crystalline; produced by fumarole volcanic activity and by hot springs, and recovered commercially from bedded sedimentary deposits associated with gypsum and salt domes. Most sulphur is now obtained as a by-product of oil-refining, since it is a common contaminant of natural oil.