Associated with Solfatara Volcanic Crater west-southwest of Naples, Italy, a solfatara, which is Italian for sulfur mine, is a fumarole, or vent, emitting predominantly sulfurous gases. Most often found in areas of diminishing volcanic activity, solfataras are nonexplosive, and their gentle vapors, when cooled, may result in a rimming deposit of minerals. A solfatara is also known as a soffione, suffione, or soffoni. The solfataric stage of volcanic activity is often used in a wider sense to include all fumaroles. A solfatara field, a group of solfataras, is also called a fumarole field.

Kim Barnes