mineral
Pyrite in Matrix
Iron Sulfide (FeS2)
Hardness: 6-6.5 Mohs; Color: Brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Poor/Indistinct; Specific Gravity: 4.9-5.2
- Hardness
- 6-6
- Color
- Brass-yellow
- Luster
- Metallic
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Physical properties
Hardness: 6-6.5 Mohs; Color: Brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Poor/Indistinct; Specific Gravity: 4.9-5.2
Formation & geological history
Forms in sedimentary rocks as nodules, in magmatic segregations, and in hydrothermal veins. It can form across various geological ages when iron and sulfur are present.
Uses & applications
Source of sulfur and sulfuric acid; historical use as a spark generator; decorative purposes and collector specimens.
Geological facts
Commonly known as Fool's Gold due to its resemblance to precious metals. It was used in the first wheel-lock muskets to provide the spark for the gunpowder.
Field identification & locations
Identify by brittle nature and dark green to black streak test (unlike gold). Found worldwide, specifically in Peru, Spain, and the USA.
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
![Biotite Schist (Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]) — metamorphic](https://media.rock.id/9ca564b5-bc87-402b-965a-69b21f9aa6bf-thumbnail.jpg)
Biotite Schist
Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]
metamorphic