mineral
Pyrite
Iron Sulfide (FeS2)
Hardness: 6-6.5 Mohs, Color: Brass-yellow, Luster: Metallic, Crystal Structure: Isometric (cubic), Cleavage: Indistinct, Specific Gravity: 4.8-5.0
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 Mohs, Color: Brass-yellow, Luster: Metallic, Crystal Structure: Isometric (cubic), Cleavage: Indistinct, Specific Gravity: 4.8-5.0
Formation & geological history
Formed in hydrothermal veins, as an accessory mineral in igneous rocks, in contact metamorphic rocks, and in sedimentary rocks such as shale and coal. Found globally in deposits of all ages.
Uses & applications
Historically a source of sulfur and sulfuric acid. Today used in some lithium batteries, as a semiconductor, and widely as a jewelry (marcasite) and collector specimen.
Geological facts
Commonly known as Fool's Gold because its color often confuses it with real gold. It can create sparks when struck against steel. The name comes from the Greek 'pyros' meaning fire.
Field identification & locations
Identify by its brassy color, hardness (it can scratch glass unlike gold), and its greenish-black streak. Commonly found in Spain, Peru, Italy, and the USA.
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sedimentary
Schist
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Metamorphic
Epidote
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metamorphic
Nephrite Jade
Nephrite
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