mineral

Sulfur (in host rock)

Native Sulfur (S8)

AI-generated identification · may be incorrect

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

Hardness: 1
Color: Bright yellow to pale yellow/greenish
Luster: Resinous to adamantine

Identified April 3, 2026More mineral →

Explore Sulfur (in host rock) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

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

Formation & geological history

Usually forms as a sublimate from volcanic gases (solfataras), near hot springs, or by the breakdown of sulfide minerals and sulfate deposits through bacterial action or thermal decomposition.

Uses & applications

Used primarily in the industrial production of sulfuric acid, fertilizers, gunpowder, matches, and insecticides. Some high-quality crystal specimens are sought by collectors.

Geological facts

Sulfur has been known since ancient times and is referred to in the Bible as 'brimstone.' It burns with a blue flame and emits a suffocating odor of sulfur dioxide.

Field identification & locations

Identify by its distinctive bright yellow color, low hardness (can be scratched by a fingernail), and the faint odor of rotten eggs if struck or heated. Commonly found in volcanic regions like Sicily, Italy, or the Andes mountains.