mineral
Pyrite
Iron sulfide (FeS2)
Hardness 6-6.5, brass-yellow color, metallic luster, isometric crystal structure, uneven fracture, specific gravity 4.95-5.10
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Physical properties
Hardness 6-6.5, brass-yellow color, metallic luster, isometric crystal structure, uneven fracture, specific gravity 4.95-5.10
Formation & geological history
Forms in a variety of geological environments including sedimentary, igneous, and metamorphic rocks. Often found in hydrothermal veins and as a replacement mineral in sedimentary rocks.
Uses & applications
Historically used to produce sulfur dioxide for paper industry and sulfuric acid. Minor ore of iron. Often used in jewelry and popular among collectors.
Geological facts
Known as 'Fool's Gold' due to its superficial resemblance to gold. Can spark when struck against steel, hence the name 'pyrite' from the Greek word for fire.
Field identification & locations
Identify by its brassy yellow color, hardness (cannot be scratched by a knife, unlike gold), and black streak. Common worldwide, notable deposits in Spain, Peru, and the USA.
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Regolith / Silicate Mineral Aggregate
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Limonite / Goethite (Iron Ore Mineral nodule)
FeO(OH)·nH2O / FeO(OH)
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Septarian Pebble
Septarian nodule / Concretion
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Schist
Schist
Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral