mineral
Pyrite in Matrix
Iron Disulfide (FeS2)
Hardness: 6-6.5 Mohs; Color: Pale brass-yellow to gray; Luster: Metallic; Crystal Structure: Isometric (cubic); Cleavage: Indistinct; Specific Gravity: 4.8-5.0
- Hardness
- 6-6
- Color
- Pale brass-yellow to gray
- Luster
- Metallic
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Physical properties
Hardness: 6-6.5 Mohs; Color: Pale brass-yellow to gray; 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, and in sedimentary environments through the reduction of sulfates. Found globally across various geological ages.
Uses & applications
Historically used for making sulfuric acid and as a spark-starter in firearms; currently a minor ore of iron/sulfur and popular for ornamental specimens and jewelry.
Geological facts
Often called Fool's Gold due to its resemblance to precious metals. It's actually harder and more brittle than gold and produces a black streak rather than a gold one.
Field identification & locations
Identify in the field by its brassy color, cubic crystal habits, and heavy weight. Common in mining districts and sedimentary rock layers.
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Mineral/Rock
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Metamorphic Rock
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Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral