Fools Gold

Sulfate released from decomposing pyrite combines with water, producing sulfuric acid , leading to acid rock drainage. An example of acid rock drainage caused by pyrite is the Gold King Mine waste water spill. Pyrite oxidation is sufficiently exothermic that underground coal mines in high-sulfur coal seams have occasionally had serious problems with spontaneous combustion in the mined-out areas of the mine. The solution is to hermetically seal the mined-out areas to exclude oxygen.

In modern coal mines, limestone dust is sprayed onto the exposed coal surfaces to reduce the hazard of dust explosions. This has the secondary benefit of neutralizing the acid released by pyrite oxidation and therefore slowing the oxidation cycle described above, thus reducing the likelihood of spontaneous combustion.

Fool's Gold () - IMDb

In the long term, however, oxidation continues, and the hydrated sulfates formed may exert crystallization pressure that can expand cracks in the rock and lead eventually to roof fall. Building stone containing pyrite tends to stain brown as the pyrite oxidizes. This problem appears to be significantly worse if any marcasite is present. These problems included a foul odor and corrosion of copper wiring. Modern tests for aggregate materials [42] certify such materials as free of pyrite. Pyrite and marcasite commonly occur as replacement pseudomorphs after fossils in black shale and other sedimentary rocks formed under reducing environmental conditions.

As a replacement mineral in an ammonite from France. Pyrite from the Sweet Home Mine, with golden striated cubes intergrown with minor tetrahedrite, on a bed of transparent quartz needles. From Wikipedia, the free encyclopedia. For other uses, see Fool's Gold disambiguation. This article is about iron pyrite.

For other pyrite minerals, see Pyrite group. This section needs additional citations for verification.

The meaning and origin of the expression: Fools' gold

Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. January Learn how and when to remove this template message. Paraspirifer bownockeri in pyrite. Pink fluorite perched between pyrite on one side and metallic galena on the other side.

Manual of Mineralogy 20th ed. John Wiley and Sons. Volume I Elements, Sulfides, Sulfosalts. Mineralogical Society of America. A Glossary of the Mining and Mineral Industry. United States Bureau of Mines. Tufts University — via Perseus. Descriptive Mineralogy 6th ed. Translated by Hoover, H. Principles of extractive metallurgy 2nd ed.

Handbook and Application Manual. Small particles of pyrite cannot be cut. Chalcopyrite in Dolomite and Quartz: Gold-colored minerals can be tested even if they are embedded in a rock.

Separating Fool's Gold from Gold

The gold-colored mineral in this rock is chalcopyrite, and a person could determine that it is not gold by poking the gold-colored material with a pin and observing if it dents or breaks. Chalcopyrite and small pieces of biotite mica can fool you. Chalcopyrite a copper iron sulfide has very similar properties to pyrite. It has a lower hardness than pyrite 3.

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Chalcopyrite also has a greenish black streak. Many people are surprised that biotite mica can fool people into thinking that it is gold. This most often occurs when an inexperienced person is panning for gold and sees a bright flash in their gold pan. After chasing the tiny, highly lustrous flake, they think that it might be gold. However, slight pressure with a pin can break the flake of mica, but a tiny flake of gold will bend around the pin. These quick tests separate pyrite from real gold.

Find Other Topics on Geology. Maps Volcanoes World Maps. The most important gold prospecting tool. How to Pan for Gold. Galleries of igneous, sedimentary and metamorphic rock photos with descriptions. Information about ore minerals, gem materials and rock-forming minerals. Articles about volcanoes, volcanic hazards and eruptions past and present.

Colorful images and articles about diamonds and colored stones. Articles about geysers, maars, deltas, rifts, salt domes, water, and much more! Hammers, field bags, hand lenses, maps, books, hardness picks, gold pans. Highest mountain, deepest lake, biggest tsunami and more. But then she breaks the most important rule of all: Benjamin Barry is an advertising executive and ladies' man who, to win a big campaign, bets that he can make a woman fall in love with him in 10 days.

Benjamin Finnegan is a deep-sea treasure hunter certain he's onto the find of the century in waters near an island close to Key West owned by a murderous rap star to whom Ben is in debt. Ben's flat broke and recently divorced from Tess, his long-time research and diving partner whom he still loves. She's nearby, working as a steward aboard the yacht of Nigel Honeycutt, a multimillionaire.

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Fool's Gold

Find showtimes, watch trailers, browse photos, track your Watchlist and rate your favorite movies and TV shows on your phone or tablet! Keep track of everything you watch; tell your friends. Full Cast and Crew. A new clue to the whereabouts of a lost treasure rekindles a married couple's sense of adventure -- and their estranged romance.