Native Sulfur

Hardness: 1.5-2.5 on Mohs scale; Color: Bright yellow to greenish-yellow; Luster: Resinous to adamantine; Crystal Structure: Orthorhombic; Cleavage: Poor/Imperfect; Specific Gravity: 2.07

Primary formation occurs in volcanic environments through sublimation from volcanic gases (fumaroles). It also forms as a secondary mineral through the breakdown of sulfide minerals or by bacterial action in sedimentary evaporite deposits. Geological age varies widely from Cenozoic to ancient Precambrian deposits.

Primarily used in the chemical industry for sulfuric acid production, fertilizers (phosphates), vulcanization of rubber, gunpowder, matches, and insecticides. High-quality crystals are used as collector specimens.

Sulfur is known for its distinct 'rotten egg' smell when burned (producing sulfur dioxide), though the mineral itself is odorless in solid form unless friction is applied. It was historically referred to as 'brimstone.'

Field identification: Bright yellow color, low hardness (can be scratched by a fingernail), and low melting point. Commonly found near volcanic craters, hot springs, and in salt dome cap rocks. Major locations include Sicily (Italy), the Gulf Coast (USA), and the Andes mountains.