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THE MINERAL PYRITE
Chemistry: FeS2, Iron Sulfide
Class: Sulfides
Group: Pyrite
Uses: A very minor ore of sulfur for sulfuric acid, used in jewelry under the trade name "marcasite" and as mineral specimens.
Specimens
Pyrite is the classic "Fool's Gold". There are other shiny brassy yellow minerals, but pyrite is by far the most common and the most often mistaken for gold. Whether it is the golden look or something else, pyrite is a favorite among rock collectors. It can have a beautiful luster and interesting crystals. It is so common in the earth's crust that it is found in almost every possible environment, hence it has a vast number of forms and varieties.
Bravoite is the name given to a nickel-rich iron sulfide. It is closely related to pyrite but contains up to 20% nickel. Some mineral books treat it as a variety of pyrite.
Pyrite is a polymorph of marcasite, which means that it has the same chemistry, FeS2, as marcasite; but a different structure and therefore different symmetry and crystal shapes. Pyrite is difficult to distinguish from marcasite when a lack of clear indicators exists
2006-10-13 10:53:00
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answer #1
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answered by shirley e 7
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Pyrite is an iron sulphide, and a common ore for both iron and for the manufacture of sulphur compounds. It's quite a common mineral and not worth a lot, aside from commercial value for large quantities (i.e. tonnes of it). In small quantities, it's a pretty stone, but not worth a huge amount.
2016-05-21 23:43:43
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answer #2
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answered by ? 4
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The mineral pyrite, or iron pyrite, is iron disulfide, FeS2. It has isometric crystals that usually appear as cubes. The cube faces may be striated (parallel lines on crystal surface or cleavage face) as a result of alternation of the cube and pyritohedron faces.
2006-10-13 10:52:37
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answer #3
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answered by Cyclone 1
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Pyrite is fools gold. It's a cheap medal.
2006-10-13 10:51:55
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answer #4
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answered by Anonymous
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It's a metal.
Iron pyrite is also called fools gold because it looks like gold. But it is much harder.
2006-10-13 10:51:57
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answer #5
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answered by Privratnik 5
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omg we just learned about this earlier this week!
pyrite is fool's gold. its color is gold, obviously, and the shape is kinda like a bunch of buildings stuck together cus its all straight.
good luck w/ dat project.
2006-10-13 10:52:27
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answer #6
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answered by dover_luv 3
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The mineral pyrite, or iron pyrite, is iron disulfide, FeS2. It has isometric crystals that usually appear as cubes. The cube faces may be striated (parallel lines on crystal surface or cleavage face) as a result of alternation of the cube and pyritohedron faces. Pyrite also frequently occurs as octahedral crystals and as pyritohedra (a dodecahedron with pentagonal faces). It has a slightly uneven and conchoidal fracture, a hardness of 6–6.5, and a specific gravity of 4.95–5.10. It is brittle, meaning it breaks or powders easily. Its metallic luster and pale-to-normal brass-yellow hue have earned it the nickname fool's gold, but ironically, small quantities of actual gold are sometimes found in pyrite. In fact, such auriferous pyrite is a valuable ore of gold.
Pyrite is the most common of the sulfide minerals. It is usually found associated with other sulfides or oxides in quartz veins, sedimentary rock and metamorphic rock, as well as in coal beds, and as the replacement mineral in fossils.
Pyrite exposed to the environment during mining and excavation reacts with oxygen and water to form sulfuric acid, resulting in acid mine drainage. This results from the action of Thiobacillus bacteria, which generate their energy by using oxygen to oxidize ferrous iron (Fe2+) to ferric iron (Fe3+). The ferric iron in turn reacts with pyrite to produce ferrous iron and sulfuric acid. The ferrous iron is then available for oxidation by the bacteria; this cycle can continue until the pyrite is exhausted.
Pyrite is used for the production of sulfur dioxide, e.g. for the paper industry, and in the manufacture of sulfuric acid, though such applications are declining in importance.
Pyrites can show negative resistance and have experimentally been used in oscillator circuits as radio detectors [2].
The name pyrite is from the Greek word "Pyr" meaning "fire". This is likely due to the sparks that result when pyrite is struck against steel. This capacity made it popular for use in early firearms such as the wheellock.
In her historical fiction book The Valley of Horses, Jean Auel's heroine Ayla is described as inventing a new method of creating fire by striking a pyrite-like material against flint.
Pyrite and marcasite
Pyrite is often confused with the mineral marcasite, a name derived from the Arabic word for pyrite, due to their similar characteristics. Marcasite is a polymorph of pyrite, which means it has the same formula as pyrite but a different structure and, therefore, different symmetry and crystal shapes. The formal oxidation states are, however, the same as in pyrite because again the sulfur atoms occur in persulfide-like pairs. Marcasite/pyrite is probably the most famous polymorph pair next to the diamond/graphite pair.
Marcasite is metastable relative to pyrite and will slowly be changed to pyrite if heated or given enough time. Marcasite is relatively rare, but may be locally abundant in some types of ore deposits, such as Mississippi Valley-type Pb-Zn deposits. Marcasite appears to form only from aqueous solutions.
Pyrite is often used in jewellery (jewelry) such as necklaces and bracelets, but although the two are similar, marcasite cannot be used in jewellery as it has a tendency to crumble into powder. Adding to the confusion between marcasite and pyrite is the use of the word marcasite as a jewellery trade name. The term is applied to small polished and faceted stones that are inlaid in sterling silver, but even though they are called marcasite, they are actually pyrite.
You could get more information from the link below...
2006-10-14 02:22:30
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answer #7
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answered by catzpaw 6
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This is an animal not a vegetable. If you eat it then it will eat you because it is as fast as a cheetah but as hungry as a hippo.
Mineral deposits on its teeth are usually calcium from eating human bones.
2006-10-13 10:52:15
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answer #8
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answered by Sid Snot 1
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Iron disulfide.
2006-10-13 10:52:44
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answer #9
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answered by Anonymous
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fools gold , seriously
2006-10-13 10:51:49
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answer #10
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answered by ? 4
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