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Glittering
Stones >> Semi
precious stones >> Pyrite
Semi Precious Stone Pyrite
Pyrite is the most common form of the sulfide minerals. It is
usually found associated with other sulfides and oxides in quartz
veins, sedimentary rock and metamorphic rock, as well as in coal
beds, and also as the replacement mineral in fossils.
Pyrite exposed to the environment during mining
and also excavation reacts with oxygen and water to form sulfuric
acid, resulting in acid mine drainage. This results from the action
of Trio bacillus bacteria, which generate their energy by using
oxygen to oxidize ferrous iron (Fe2+) that ferric iron (Fe3+).
The ferric iron in turn reacts with pyrite to
produce ferrous iron and also sulfuric acid. The ferrous iron
is then available for oxidation by the bacteria; this cycle could
continue until the pyrite is exhausted.
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Historical Facts of Pyrite
| Refractive index |
Opaque |
| Chemical Composition |
Iron disulfide (FeS2) |
| Crystal system |
Isometric |
| Mohs Scale hardness |
6 – 6.8 |
| Density |
4.95 – 5.10 |
| Luster |
Metallic, Glistening |
| Color |
Pale brass yellow, Dull gold |
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Gemstone Jewelry Pyrite
| Pyrite Bracelet |
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| Pyrite Earrings |
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| Pyrite Necklace |
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| Pyrite Rings |
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