Damon Mcknight
Pyrite, also known as fool's gold, is an iron sulfide mineral with the chemical formula FeS2. It is one of the most common rocks in the world and can be found in a variety of geological settings, including igneous, sedimentary, and metamorphic rocks, as well as coal beds and fossils. Pyrite is particularly abundant in Spain, the United States, and Australia. In Australia, pyrite can be found in a range of locations, from the Australian Museum to the streets and beaches.
| Characteristics | Values |
|---|---|
| Pyrite's other names | Fool's Gold, Brass, Brazzle, Brazil, Iron Pyrite |
| Pyrite's composition | Iron Sulfide (FeS2) |
| Pyrite's colour | Pale brass-yellow, white, yellow, deep green, iron red |
| Pyrite's crystal structure | Cuboid crystals, raspberry-shaped masses (framboids), anastomosing filaments, T-shaped crystals, dodecahedron-shaped (pyritohedra) |
| Pyrite's occurrence in Australia | Common, can be found in cities, houses, streets, beaches |
| Pyrite's occurrence globally | Very common, found in a wide variety of geological formations |
| Pyrite's association with gold | Sometimes found with small quantities of gold, often mistaken for gold |
| Pyrite's uses | Jewellery, source of sulphur, semiconductor, ignition in early firearms, traditional method of creating fire used by the Kaurna people of South Australia |
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What You'll Learn
- Pyrite is found in quartz veins, sedimentary rock, and coal beds
- It's also found as a replacement mineral in fossils
- Pyrite is widespread in igneous, metamorphic, and sedimentary rocks
- It's a common accessory mineral in shale and igneous rocks
- Pyrite is found in large deposits in contact metamorphic rocks
Pyrite is found in quartz veins, sedimentary rock, and coal beds
Pyrite, also known as iron pyrite or fool's gold, is a brass-yellow mineral with a bright metallic lustre. It is an iron sulfide with the chemical formula FeS2 (iron (II) disulfide). Pyrite is found in quartz veins, sedimentary rock, and coal beds.
Pyrite is a common accessory mineral in sedimentary rocks, particularly in limestone, sandstone, and carbonaceous siltstones or shales. It occurs both as a primary mineral, present in the original sediments, and as a secondary mineral, deposited during diagenesis. Pyrite and marcasite commonly occur as replacement pseudomorphs after fossils in black shale and other sedimentary rocks formed under reducing environmental conditions.
Pyrite is also found in coal beds, often containing significant amounts. The formation of pyrite requires the presence of organic matter in the sediment, sulfate in solution in the pore water, and a locally anaerobic (reducing) chemical environment. Coal and black shale are dark-coloured, organic-rich sediments that provide the necessary conditions for pyrite formation.
Pyrite is also found in quartz veins, which are hydrothermal veins formed at high temperatures. Pyrite can be mined for the gold, copper, or other elements associated with it. In ancient Roman times, pyrite was used to create sparks when struck against steel. Today, pyrite is commercially used for the production of sulfur dioxide for the paper industry and the production of sulfuric acid.
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$5.49
It's also found as a replacement mineral in fossils
Pyrite, also known as "fool's gold", is a common mineral found in many fossil collections. It is an iron sulfide with the chemical formula FeS2 (iron (II) disulfide). Pyrite is often found in association with other sulfides or oxides in quartz veins, sedimentary rock, and metamorphic rock, as well as in coal beds. Pyrite is also found as a replacement mineral in fossils.
Pyrite is a common replacement mineral in fossils, along with other minerals such as quartz, calcium phosphate, and opal. Replacement minerals are those that replace the organic material in a fossil, preserving its original shape and structure. In the case of pyrite, fossils can become pyritised in sediments high in iron sulfides. Sulphides are produced by decaying organisms, usually present in organic-rich sediments as a result of anaerobic bacterial digestion.
Pyrite fossils have a brassy, metallic gold colour and are naturally quite shiny. They can be found in many places around the world, including the beaches of Charmouth, the Holderness Coast, and the Coober Pedy Opal Field in South Australia. Many ammonites, bones, and other fossils can be preserved either partly or entirely made up of pyrite.
However, pyrite is not always stable and can decay, completely destroying some specimens. This process, known as pyrite oxidation or pyrite decay, causes the mineral to oxidise and form iron sulphate (FeSO4). The oxidation product is several times the volume of the original mineral, and the resulting crystal growth and expansion cause the specimen to fracture and crumble. Once the damage begins, it is irreversible, and the best way to prevent it is by keeping fossils in dry conditions below 45% relative humidity.
Pyrite has been used by humans for various purposes throughout history. It was known to the ancient Romans, who used it to create sparks when struck against steel. In the 16th and 17th centuries, pyrite gained popularity as a source of ignition in early firearms. Today, pyrite is still valued for its aesthetic qualities and is often collected and displayed in private and public collections.
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Pyrite is widespread in igneous, metamorphic, and sedimentary rocks
Pyrite, also known as "fool's gold", is a FeS2 mineral that is widespread in nature. It is commonly found in igneous, metamorphic, and sedimentary rocks.
In igneous rocks, pyrite is a common accessory mineral, sometimes occurring as larger masses due to an immiscible sulfide phase in the original magma. It is also found in metamorphic rocks, formed through contact metamorphism, and as a high-temperature hydrothermal mineral. Pyrite can occur as a primary mineral in original sediments or as a secondary mineral deposited during diagenesis.
Pyrite is often associated with other sulfides or oxides and can be found in quartz veins, sedimentary rock, and coal beds. It is also known to occur as a replacement mineral in fossils and sclerites of scaly-foot gastropods. Pyrite is widely distributed and can form under varied conditions, such as magmatic segregation, hydrothermal solutions, or stalactitic growth.
The mineral's resemblance to gold in colour and lustre has earned it the nickname "fool's gold". Pyrite has a pale brass-yellow hue, which can be misleading to the untrained eye. However, it is lighter and harder than gold and cannot be scratched with a fingernail or pocket knife. Pyrite has been used in jewellery and is often made into pendants and earrings.
Pyrite is abundant in Australia and is sought after by rock collectors and hobbyists. It can be found in various places, from one's house to the beach, due to its widespread occurrence in different types of rocks.
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It's a common accessory mineral in shale and igneous rocks
Pyrite, also known as iron pyrite or fool's gold, is a common accessory mineral in shale and igneous rocks. It is an iron sulfide with the chemical formula FeS2 (iron (II) disulfide). Pyrite is the most abundant sulfide mineral and is widespread in igneous, metamorphic, and sedimentary rocks. It is formed in an oxygen-poor environment, often in association with decaying organic materials. This is why pyrite is commonly found in dark-coloured, organic-rich sediments such as coal and black shale.
Pyrite is a common accessory mineral in igneous rocks, where it occasionally occurs as larger masses arising from an immiscible sulfide phase in the original magma. It is also found in metamorphic rocks as a product of contact metamorphism. Pyrite forms as a high-temperature hydrothermal mineral, although it can sometimes form at lower temperatures. It occurs as both a primary and secondary mineral, present in original sediments and deposited during diagenesis, respectively.
Pyrite is often found in association with other sulfides or oxides in quartz veins, coal beds, and as a replacement mineral in fossils. It has a brass-yellow colour, a metallic lustre, and a high specific gravity. It is harder than other yellow metallic minerals, and its streak is black with a tinge of green. Pyrite often occurs in well-formed crystals in the shape of cubes, octahedrons, or pyritohedrons, with striated faces.
The name pyrite comes from the Greek 'pyrites lithos', meaning 'stone or mineral which strikes fire'. This is because, when struck against steel, pyrite creates sparks. Its colour and lustre give it a resemblance to gold, which is why it is nicknamed 'fool's gold'. Pyrite is quite easy to distinguish from gold, however, as it is much lighter and harder, and cannot be scratched with a fingernail or pocket knife.
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Pyrite is found in large deposits in contact metamorphic rocks
Pyrite, also known as iron pyrite or fool's gold, is a widespread mineral found in a variety of geological formations. It is commonly associated with other sulfides or oxides in quartz veins, sedimentary rock, and metamorphic rock, as well as in coal beds and fossil replacements. Pyrite is particularly known for its presence in large deposits of contact metamorphic rocks.
Contact metamorphism is a geological process that occurs when hot magma comes into contact with cooler rocks, causing them to undergo a transformation due to the high temperatures. This process can result in the formation of various minerals, including pyrite. The presence of pyrite in contact metamorphic rocks is a significant indicator of the geological history and conditions that formed these rocks.
In Australia, pyrite is found in the Yilgarn Craton in Western Australia. Studies have analysed the composition of pyrite in this region, particularly in relation to gold and copper exploration. The Yilgarn Craton is known for its orogenic gold deposits, which are formed through the interaction of host metasedimentary or metamafic rocks with low-salinity fluids originating from metamorphic processes.
Pyrite is often found in association with other minerals and can contain trace amounts of various elements, including nickel, cobalt, arsenic, and even gold. The composition of pyrite can vary depending on its source and the environmental conditions in which it formed. The study of pyrite compositions is valuable for mineral exploration and understanding the geological history of an area.
The presence of pyrite in large deposits in contact metamorphic rocks is of significant geological interest. It provides insights into the formation and transformation of rocks over time and can also have practical applications in mineral exploration and extraction. Pyrite has a long history of use, from its ancient use as a source of ignition to its modern applications in various industries.
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Frequently asked questions
Pyrite is found in a wide variety of geological settings, from igneous, sedimentary, and metamorphic rock to hydrothermal mineral deposits, as well as in coal beds and fossil replacements. It is one of the most abundant minerals in the world and is commonly found in the United States and Australia.
Pyrite, also known as "Fool's Gold", is an iron sulfide mineral with the chemical formula FeS2 (iron (II) disulfide). Its metallic luster and pale brass-yellow hue give it a resemblance to gold.
Pyrite is much lighter than gold but is also harder and cannot be scratched with a fingernail or pocket knife. Pyrite will also leave a dark green to black streak when scraped on a piece of unglazed porcelain, whereas gold will leave a golden yellow streak.
Pyrite has been used as a source of ignition in early firearms and as a source of sulfur for the production of sulfuric acid. It has also been used in jewelry due to its resemblance to gold. Pyrite is also being investigated for its semiconductor properties and potential use in solar cells.
Pyrite crystals can be found in your local supermarket, often in jars of rock specimens. They can also be purchased online. Some of the most beautiful pyrite crystals are said to come from Navajùn, Spain, in the Victoria Mine.
