Wild Wonders of Europe / Grunewald / Sulphuric gases coming out of a fumarole (solfatara) Vulcano, Aeolian Islands, Italy, May 2009
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Nigel Marven / Blue sulphuric/hydochloric lake in volcano crater, Kamchatka, Russia
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Mark Taylor / Men working the sulphur mine at Kawah Ijen, Java, Indonesia.
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Mark Taylor / Men working the sulphur mine at Kawah Ijen, Java, Indonesia.
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Mark Taylor / People working at sulphur mine at Kawah Ijen, Java, Indonesia.
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Mark Taylor / Sulphur mine at Kawah Ijen, Java, Indonesia.
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Mark Taylor / People working in sulphur mine at Kawah Ijen, Java, Indonesia.
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Mark Taylor / Sulphur mine at Kawah Ijen, Java, Indonesia.
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Mark Taylor / Sulphur mine at Kawah Ijen, Java, Indonesia.
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Nigel Marven / Aerial view looking down into blue sulphuric / hydrochloric lake in volcanic crater, Kamchatka, Russia
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Roberto Rinaldi / Sulphuric gases coming out of a fumerole next to the big crater (Fossa di Vulcano) on Vulcano, Aeolian Islands, Italy.
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Roberto Rinaldi / Sulphuric gases coming out of a fumerole next to the big crater (Fossa di Vulcano) on Vulcano, Aeolian Islands, Italy. In the background is Lipari Island.
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Roberto Rinaldi / Sulphuric gases coming out of a fumerole next to the big crater (Fossa di Vulcano) on Vulcano, Aeolian Islands, Italy.
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John Cancalosi / Pyrite (FeS2, iron sulfide), known as 'Fool's Gold'. Formerly used in sulphuric acid production. Sample from Viburnum Trend, Reynolds County Missouri, USA.
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John Cancalosi / Pyrite [FeS2 / Iron sulphide] from Illinois, USA. "Pyrite sun" or " pyrite dollar", popularly known as "fool's gold" - Formery used in the production of sulphuric acid
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Roberto Rinaldi / Sulphuric gases coming out of a fumerole next to the big crater (Fossa di Vulcano) on Vulcano, Aeolian Islands, Italy.
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Roberto Rinaldi / Sulphuric gases coming out of a fumerole next to the big crater (Fossa di Vulcano) on Vulcano, Aeolian Islands, Italy.
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Roberto Rinaldi / Sulphuric gases coming out of a fumerole next to the big crater (Fossa di Vulcano) on Vulcano, Aeolian Islands, Italy. In the background is Panarea.
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Roberto Rinaldi / Sulphuric gases coming out of a fumerole next to the big crater (Fossa di Vulcano) on Vulcano, Aeolian Islands, Italy.
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Roberto Rinaldi / Sulphuric gases coming out of a fumerole next to the big crater (Fossa di Vulcano) on Vulcano, Aeolian Islands, Italy.
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Roberto Rinaldi / Sulphuric gases coming out of a fumerole next to the big crater (Fossa di Vulcano) on Vulcano, Aeolian Islands, Italy.
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Roberto Rinaldi / Sulphuric gases coming out of a fumerole next to the big crater (Fossa di Vulcano) on Vulcano, Aeolian Islands, Italy.
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Roberto Rinaldi / Sulphuric gases coming out from the ground close to the big crater (Fossa di Vulcano) on Vulcano, Aeolian Islands, Italy
![Pyrite [FeS2 / Iron sulphide] from Illinois, USA. "Pyrite sun" or " pyrite dollar", popularly known as "fool's gold" - Formery used in the production of sulphuric acid](http://nplimages.infradoxxs.com/cache/tcache/01318803.jpg "Pyrite [FeS2 / Iron sulphide] from Illinois, USA. \"Pyrite sun\" or \" pyrite dollar\", popularly known as \"fool's gold\" - Formery used in the production of sulphuric acid")
