Experimental synthesis of auriferous arsenian pyrite/marcasite …
DOI: 10.1016/J.GEXPLO.2008.11.051 Corpus ID: 129072757; Experimental synthesis of auriferous arsenian pyrite/marcasite by pseudomorphic replacement of pyrrhotite @article{Xia2009ExperimentalSO, title={Experimental synthesis of auriferous arsenian pyrite/marcasite by pseudomorphic replacement of pyrrhotite}, author={Fang Xia and …
Semiconductivity in pyrite, marcasite and arsenopyrite phases
DOI: 10.1016/0022-3697(65)90173-3 Corpus ID: 97832050; Semiconductivity in pyrite, marcasite and arsenopyrite phases @article{Hulliger1964SemiconductivityIP, title={Semiconductivity in pyrite, marcasite and arsenopyrite phases}, author={Fritz Hulliger and Etta Mooser}, journal={Journal of Physics and Chemistry of Solids}, …
Petrographic and chemical characteristics of pyrite-marcasite
Core recovered from Hess Rise contains concentrations of pyrite, marcasite, and barite in the lowermost meter of limestone (Unit II) and in the brecciated upper part of the underlying volcanic basement (Unit HI). Petrographic and chemical data indicate that the sulfide-barite assemblage in the limestone is mainly a product of low-temperature diagenetic processes.
The mechanism and kinetics of the transformation …
Pyrite and marcasite, the two polymorphs of FeS 2, are among the most abundant metal sulfides in the Earth's upper crust, and play key roles in the global …
Full article: Pyrite – the firestone
A summary of pyrite's main properties is given in. Table 1. Herein, pyrite refers to the cubic sulphide FeS 2; pyrites is used as the umbrella term for a collection of yellowish metallic sulphides, see. Table 2. Note that marcasite is pyrite's unstable low temperature dimorph. Marcasite is a pyrites, it is not pyrite.
Marcasite
Marcasite, often mistaken for pyrite, exudes a vintage glamour and refined elegance, making it a beloved choice in jewelry design. Its brassy golden textures and intricate features draw both the curious eye and the spiritual heart, while the humble marcasite cruises under the radar in popular crystal healing practices, hiding powerful ...
Marcasite
marcasite and pyrite crystal groups occur in the dolostone bedrock up and down in the Mississippi River in Wisconsin and Minnesota. These minerals, however, have been …
The mechanism and kinetics of the transformation from marcasite …
Pyrite and marcasite, the two polymorphs of FeS 2, are among the most abundant metal sulfides in the Earth's upper crust, and play key roles in the global cycles of Fe and S. Commonly, these two minerals form intergrowths or alternating concentric layers (Kullerud and Yoder 1959), and are found in many types of ore deposits, including …
Fluorite with Pyrite & Marcasite Crystal
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Replacement of pyrrhotite by pyrite and marcasite …
The pyrite crystals were >10 µm in size and randomly oriented. In comparison, marcasite crystals were <1 µm in size, and no significant overgrowth was observed. At pH 21°C <3, the marcasite nanocrystals showed the well-known crystallographic relationship with pyrrhotite, but at pH 21°C 3.96, the marcasite crystallites were randomly oriented.
File : Pyrite-marcasite concretions in carbonaceous shale
Texturally, the concretions have outward-radiating crystals with moderately-developed concentricity. Mineralogically, they are principally composed of pyrite, plus minor marcasite (also FeS2 - iron sulfide; marcasite is a polymorph of pyrite). Locality: coal mine in Randolph County, southwestern Illinois, USA
[PDF] Identification of marcasite in pyrite FeS2 thin films …
In this study, we characterized FeS2 thin films grown by the non-vacuum spin-coating method. We annealed the samples under a sulfur atmosphere at different sulfurization temperatures. The phase transformation from marcasite-containing pyrite to pure pyrite occurs between 350 and 400 °C. The structural phase formation on the films …
Marcasite and Pyrite
Pyrite is also exceptionally dense, with a specific gravity of 5.0 to 5.2. Only hematite has a higher density. Marcasite tends to be lighter in color, and is sometimes referred to as "white iron pyrite". Sometime marcasite has a greenish tint, or a multi-colored tarnish that is the result of oxidation. But marcasite has an unstable orthorhombic ...
First-principle calculations of interaction of O2 with pyrite
DOI: 10.1016/S1003-6326(16)64141-9 Corpus ID: 138111176; First-principle calculations of interaction of O2 with pyrite, marcasite and pyrrhotite surfaces @article{Zhao2016FirstprincipleCO, title={First-principle calculations of interaction of O2 with pyrite, marcasite and pyrrhotite surfaces}, author={Cuihua Zhao and Jian-hua …
Marcasite: The mineral marcasite information and …
Marcasite is the lesser known companion of the famous mineral Pyrite. Marcasite has the same chemical formula as Pyrite, but crystallize s in a different crystal system, thereby …
DFT study of interactions between calcium hydroxyl ions and pyrite …
DOI: 10.1016/J.APSUSC.2015.07.081 Corpus ID: 94304143; DFT study of interactions between calcium hydroxyl ions and pyrite, marcasite, pyrrhotite surfaces @article{Zhao2015DFTSO, title={DFT study of interactions between calcium hydroxyl ions and pyrite, marcasite, pyrrhotite surfaces}, author={Cuihua Zhao and Jian-hua Chen …
Pyrite & Marcasite 101 | Rock & Gem Magazine
Pyrite and marcasite are both iron sulfide minerals with the chemical formula FeS2. Pyrite crystallizes in the isometric system and commonly forms cubic …
Replacement of pyrrhotite by pyrite and marcasite under …
title = "Replacement of pyrrhotite by pyrite and marcasite under hydrothermal conditions up to 220 degrees C: An experimental study of reaction textures and mechanisms", author = "Gujie Qian and Fang Xia and Joel Brugger and William Skinner and Jiafang Bei and Guorong Cren and Allan Pring",
Ore-forming processes of the Daqiao epizonal orogenic gold …
Sulfur isotopes determined from in situ LA-multicollector (MC)-ICP-MS analyses of hydrothermal pyrite and marcasite from the Daqiao deposit vary significantly from -31.3 to 22.0 ppm (delta (super 34) S values) but fall mostly between -10 to 10 ppm and provide important information on the source and evolution of sulfur and of the ore-forming fluids.
Marcasite
Marcasite (FeS 2) is an iron sulfide that is sometimes called "white iron pyrite" because it has the same chemical formula as pyrite.It is distinct from pyrite because it crystallizes in an orthorhombic crystal system. This mineral is normally a pale brass-yellow color and crystals occur in association with Olentangy Shale and Ohio Shale in outcrops in …
Electronic structure of 3d pyrite- and marcasite-type sulphides
Electronic structure calculations are reported for the 3d pyrite-type sulphides Fes2, CoS2, NiS2, CuS2 and ZnS2, and for marcasite-type FeS2. The energy bands are compared with the experimental data available. FeS2 is calculated to be a semiconductor, with an indirect gap of 0.7 eV (pyrite) or 0.4 eV (marcasite) separating filled t2g and empty eg sub …
Marcasite: Meaning, Properties, and Benefits You Should …
Pyrite-Marcasite: A powerful mix of the two crystals, Pyrite-Marcasite appears with orange, gold, and gray sections. Use this variety for manifestation. Calcite in Marcasite: This mix of Calcite and Marcasite creates a stunning stone with white and metallic gray structures. This variety is great for enhancing your connection with higher realms ...
Reactions forming pyrite and marcasite from solution: II. Via …
DOI: 10.1016/0016-7037(91)90123-M Corpus ID: 96643251; Reactions forming pyrite and marcasite from solution: II. Via FeS precursors below 100°C @article{Schoonen1991ReactionsFP, title={Reactions forming …
Oxidation of Pyrite and Marcasite by Thiobacillus …
A comparison of the kinetic curves of marcasite and pyrite leaching shows that the rate of pyrite oxidation is greater (Table 1). The increase of the percent contribu-tion of pyrite from 1 to 3% resulted in a twofold decrease in the reaction rate, while the same increase in marcasite contribution - a threefold increase in the reaction rate.
Marcasite
Pyrite and marcasite, on the other hand, have almost identical physical properties, making them tough to tell from each other. Let's go through their properties. Both are metallic and pale yellow to brassy yellow. Both can tarnish and be iridescent. Both are 6-6.5 on the Mohs' hardness scale. Neither have a particularly prominent cleavage ...
The distinction of pyrite from marcasite in nodular growths
page 181 note 3 M. J. Buerger (Amer. Min., 1931, vol. 16, p. 361) in his work on the structure of marcasite used molybdenum radiation. The indices and intensities of spots on marcasite photographs obtained in the present work using Cu-Kr radiation are in substantial agreement with his data.
Pyrite, pseudomorph after marcasite with pyrite and …
Specimen size: 14 x 10 x 6 inches. dc.description.abstract. Several large clusters of intergrown (former) marcasite crystals that have been replaced by pyrite--on pyrite, on sphalerite. This mineral specimen is from the Eagle mine, Gilman mining district, Eagle County, Colorado.
The pyrite—marcasite relation | American Mineralogist
Abstract. The control of the precipitation of pyrite and marcasite by chemical environment suggests that these two minerals are not a dimorphous pair in the usual sense of the …
Pyrite
Pyrite (or iron pyrite) is the most common of the sulfide minerals.Chemically, it is known as iron disulfide (FeS 2).Its metallic luster and brassy hue have earned it the nickname fool's gold.Ironically, small quantities of actual gold are occasionally associated with pyrite. Its polymorphic form, called marcasite, has the same chemical formula but is structurally …
Energy bands in TX2 compounds with pyrite, marcasite, and arsenopyrite
The three structures: pyrite, marcasite, and arsenopyrite, are characterized by diatomic anions. These signal the formation of a single anion-pair bond, which means that the interacting orbitais per anion pair are split into a filled, bonding molecular o-^ orbital and an empty, antibonding molecular o^* orbital.
