File:Pyrite in bituminous coal (Pennsylvanian; eastern USA) (18858200370).jpg
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Pyrite in bituminous coal from the Pennsylvanian of eastern USA. A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 4900 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates. The sulfide minerals contain one or more sulfide anions (S-2). The sulfides are usually considered together with the arsenide minerals, the sulfarsenide minerals, and the telluride minerals. Many sulfides are economically significant, as they occur commonly in ores. The metals that combine with S-2 are mainly Fe, Cu, Ni, Ag, etc. Most sulfides have a metallic luster, are moderately soft, and are noticeably heavy for their size. These minerals will not form in the presence of free oxygen. Under an oxygen-rich atmosphere, sulfide minerals tend to chemically weather to various oxide and hydroxide minerals. Pyrite is a common iron sulfide mineral (FeS2). It’s nickname is “fool's gold”. Pyrite has a metallic luster, brassy gold color (in contrast to the deep rich yellow gold color of true gold - www.flickr.com/photos/jsjgeology/sets/72157651325153769/), dark gray to black streak, is hard (H=6 to 6.5), has no cleavage, and is moderately heavy for its size. It often forms cubic crystals or pyritohedrons (crystals having pentagonal faces). Pyrite is common in many hydrothermal veins, shales, coals, various metamorphic rocks, and massive sulfide deposits. Pyrite is a common impurity in bituminous coal. It is an undesirable impurity because burning pyritic coal results in air pollution and acid rain. Many Pennsylvanian-aged bituminous coal horizons in eastern America have pyrite impurities. In western America, Tertiary-aged lignite and sub-bituminous coal is moderately common in some sedimentary basins. These western coals are typically low-pyrite and are desirable for use in electricity-generating power plants. Photo gallery of pyrite: www.mindat.org/gallery.php?min=3314 |
| Date | |
| Source | Pyrite in bituminous coal (Pennsylvanian; eastern USA) |
| Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://flickr.com/photos/47445767@N05/18858200370. It was reviewed on 19 July 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 19:35, 19 July 2015 | | 1,062 × 680 (1.39 MB) | Natuur12 (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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