mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Hardness: 6-6.5 Mohs. Color: Pale brass-yellow. Luster: Metallic. Crystal structure: Isometric (often cubic or pyritohedral). Cleavage: Indistinct. Specific gravity: 4.8-5.0.
- Hardness
- 6-6
- Color
- Pale brass-yellow
- Luster
- Metallic
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Physical properties
Hardness: 6-6.5 Mohs. Color: Pale brass-yellow. Luster: Metallic. Crystal structure: Isometric (often cubic or pyritohedral). Cleavage: Indistinct. Specific gravity: 4.8-5.0.
Formation & geological history
Forms in diverse conditions including hydrothermal veins, as an accessory mineral in igneous rocks, in contact metamorphic rocks, and in sedimentary environments like coal beds and shales.
Uses & applications
Historically a source of sulfur and sulfuric acid. Used in the production of iron vitriol. Used today as a gemstone (marcasite jewelry) and as an ornamental mineral for collectors.
Geological facts
Its name comes from the Greek word 'pyr' meaning fire, because it emits sparks when struck by metal. It is the most common sulfide mineral.
Field identification & locations
Identify by its metallic luster, golden color, and green-black streak (real gold has a yellow streak). Found worldwide; famous localities include Spain (Rio Tinto) and Italy (Elba).
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Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
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Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
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