Sulphur (Native Sulphur)
Image: Kurr, J. G. (Johann Gottlob), 1798-1870 (Public domain)
Mineral NameSulphur (Native Sulphur)
Chemical FormulaS
Mohs Hardness1.5
Crystal Systemorthorhombic
Lusterresinous
Streak Colorwhite to pale yellow
Cleavageimperfect
Fractureconchoidal to uneven
Specific Gravity2.07
Colorsyellow, yellowish-brown, greenish-yellow
Transparencytransparent to translucent
Type LocalitySicily (Italy), Japan, Indonesia, Louisiana (USA)
Mineral GroupNative Elements
Useschemical industry, fertilizers, fungicides, collector
Associated Mineralsgypsum, calcite, aragonite, celestine, halite
Raritycommon
Description
Native sulphur typically forms bright yellow to yellowish-brown crystals, often dipyramidal or tabular, or as massive, earthy, or encrusting forms. It has a distinctive resinous luster and is easily recognizable by its color and crystal habit.
Geological Context
Native sulphur forms primarily in volcanic fumaroles and solfataras, where hydrogen sulfide gas reacts with sulfur dioxide gas. It also occurs in sedimentary deposits associated with evaporites, salt domes, and petroleum, often formed by bacterial reduction of sulfates.
