mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (cubic); Cleavage: Indistinct; Specific Gravity: 4.9-5.2

Hardness: 6-6
Color: Pale brass-yellow to golden
Luster: Metallic

Identified May 23, 2026More mineral →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (cubic); Cleavage: Indistinct; Specific Gravity: 4.9-5.2

Formation & geological history

Forms in diverse environments including hydrothermal veins, sedimentary rocks through biological activity, and as an accessory mineral in igneous rocks across all geological ages.

Uses & applications

Historical source of sulfur and sulfuric acid; used in jewelry (as 'marcasite'), mineral collecting, and occasionally as a semiconductor in early radio receivers.

Geological facts

Commonly known as 'Fool's Gold' due to its resemblance to real gold. It is the most common sulfide mineral found on Earth.

Field identification & locations

Identify in the field by its metallic luster, greenish-black streak, and cubic crystal habits (if present). Unlike gold, it is brittle and will shatter if struck. Found globally, especially in Peru, Spain, and the USA.