This document discusses the natural occurrence of sulfur. It notes that sulfur has been used for thousands of years, including by the Romans to purify sick rooms and in gunpowder. Sulfur exists in both a free state found in volcanic areas and a combined state as ores. The largest sulfur deposits are located in Louisiana, Texas, Sicily and Japan. Important sulfur ores mentioned include iron pyrites, copper pyrites, zinc blende, galena and gypsum.

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Natural Occurrence of
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Learning objectives
The learner is able to
1. recollect the historical uses of sulphur
2. know the different states of sulphur
3. know the presence of free sulphur in volcanic areas
4. know the occurrence of sulphur various places in the
world
5. list the combined states (ores) of sulphur

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Sulphur means “burning stone” in Latin.
1. History of Sulphur
Boiling sulphur on earthBoiling sulphur on earth
Explanation

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Romans have used sulphur fumes to purify sick room .
1. History of Sulphur
Sulphur caveSulphur cave
Explanation

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Sulphur was used in war as gun powder.
1. History of Sulphur
Explanation
Gun powder

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2. Different States of Sulphur
Sulphur occurs in free state and in combined state.
Combined
state
Free state
Explanation

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Free sulphur is present in volcanic areas.
4. Free states
Volcanoes

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5. Sulphur deposits in the world
Louisiana and Texas have the largest deposits of sulphur in United
States.

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Sicily and Japan have some sulphur deposits.
5. Sulphur deposits in the world

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Iron pyrites is one of the important ores of sulphur.
Combined states
Iron pyrites (FeS2)

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Copper pyrites another important ore of sulphur.
Copper pyrites (CuFeS2)
5. Combined states

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Zinc blende and lead sulphide are another ores of sulphur.
Zinc blende (ZnS) Galena (PbS)
5. Combined states

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Calcium sulphate contains sulphur.
Gypsum (Calcium sulphate dihydrate)
5. Combined states

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Recap
Summary:
• Sulphur has been used 4000 years ago
• Free sulphur is present in volcanic areas
• Sulphur deposits are present in huge quantities in
U.S., Italy and Japan
• The important ores of sulphur are iron pyrites, copper
pyrites, zinc blende, Galena and Gypsum.