mineral
Pyrite
Iron Sulfide (FeS2)
Hardness: 6-6.5 Mohs, Color: Pale brass-yellow, Luster: Metallic, Crystal Structure: Cubic/Isometric, Fracture: Conchoidal/Uneven, Specific Gravity: 4.8-5.0
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 Mohs, Color: Pale brass-yellow, Luster: Metallic, Crystal Structure: Cubic/Isometric, Fracture: Conchoidal/Uneven, Specific Gravity: 4.8-5.0
Formation & geological history
Forms in diverse geological environments including sedimentary rocks as nodules, in magmatic segregations, and in hydrothermal veins associated with other minerals.
Uses & applications
Mainly used as a source of sulfur for sulfuric acid production and as a minor ore of gold. Common as collector specimens and in costume jewelry.
Geological facts
Commonly known as 'Fool's Gold' because of its metallic luster and brassy hue, which have confused prospectors for centuries.
Field identification & locations
Identify by its cubic crystal form and brassy color; unlike gold, it is brittle and will shatter if struck. Found globally, specifically in Peru, Spain, and the USA.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Schist
Schist
Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
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Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
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Mineral/Rock