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
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