mineral

Pyrite in Host Rock

Iron Disulfide (FeS2)

AI-generated identification · may be incorrect

Hardness: 6-6.5 Mohs scale. Color: Brass-yellow or gold-like in metallic areas, grey/green host rock. Luster: Metallic. Crystal structure: Isometric (often cubic or pyritohedral). Specific gravity: 4.9-5.2.

Hardness: 6-6
Luster: Metallic

Identified July 2, 2026More mineral →

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Physical properties

Formation & geological history

Formed in diverse environments including hydrothermal veins, sedimentary rocks under anaerobic conditions, and contact metamorphic deposits. Often associated with other sulfides and quartz.

Uses & applications

Historically used to create sparks for firearms (wheel-lock); currently used for sulfur and sulfuric acid production, and as a collector's mineral. Occasionally used in jewelry as 'marcasite'.

Geological facts

Known as 'Fool's Gold' because its color and high specific gravity can easily deceive novice prospectors. It is the most common sulfide mineral on Earth.

Field identification & locations

Identified by its metallic luster, brittle nature (unlike malleable gold), and greenish-black streak. Commonly found in mining districts and shale beds globally. Location suggests potential origin from the Meratus or Central Kalimantan geological complexes.