mineral
Pyrite
Iron Sulfide (FeS2)
AI-generated identification · may be incorrectHardness of 6-6.5 on the Mohs scale, brassy yellow color with a metallic luster, isometric crystal system, and a greenish-black streak.
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Physical properties
Hardness of 6-6.5 on the Mohs scale, brassy yellow color with a metallic luster, isometric crystal system, and a greenish-black streak.
Formation & geological history
Forms in hydrothermal veins, sedimentary rocks, and metamorphic deposits through low-temperature precipitation from sulfur-rich solutions.
Uses & applications
Used in the historical production of sulfur and sulfuric acid, jewelry making, and highly prized by mineral collectors.
Geological facts
Commonly known as 'Fool's Gold' due to its superficial resemblance to actual gold, though it produces sparks when struck against steel.
Field identification & locations
Easily identified by its brassy metallic sheen, cubic crystal habit, and high specific gravity; found globally with notable deposits in Peru, Spain, and the USA.
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Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Limonite
FeO(OH)•nH2O
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Limonite
FeO(OH)•nH2O
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Feldspar
Feldspar Group (Tectosilicate, e.g., KAlSi3O8)
mineral