mineral
Pyrite
Iron Sulfide (FeS2)
AI-generated identification · may be incorrectMohs hardness 6 to 6.5, metallic luster, brassy pale yellow to silvery-gold color, isometric crystal system (often cubic, pyritohedral, or octahedral forms), poor/indistinct cleavage, specific gravity ~5.0
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Physical properties
Mohs hardness 6 to 6.5, metallic luster, brassy pale yellow to silvery-gold color, isometric crystal system (often cubic, pyritohedral, or octahedral forms), poor/indistinct cleavage, specific gravity ~5.0
Formation & geological history
Forms in a wide variety of geological settings, including hydrothermal veins, sedimentary rocks under reducing conditions, contact metamorphic deposits, and igneous rocks.
Uses & applications
Historically used as a source of sulfur and sulfuric acid. Today it is popular for mineral specimens, decorative carvings, metaphysical collections, and occasionally costume jewelry.
Geological facts
Nicknamed 'Fool's Gold' due to its superficial metallic resemblance to real gold. Unlike gold, pyrite is brittle, much harder, and produces a greenish-black streak when scratched on porcelain.
Field identification & locations
Look for crisp metallic luster, cubic or striated crystal faces, and brass-yellow color. Found worldwide, with notable specimen localities in Spain, Peru, Italy, and the USA.
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Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Calcite–fluorite mineral specimen with iron-oxide staining
Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
mineral