The carbonate minerals, calcite, dolomite and ankerite were precipitated, with stringers ofmarcasiteand trace chalcopyrite.
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These deposits are hosted in competent strata with sulphide mineralogies of galena + sphalerite + chalcopyrite + pyrite +marcasiteand associated carbonates + quartz + baryte.
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Galena, sphalerite, pyrite andmarcasiteare the main sulphide minerals, with associated calcite, dolomite, quartz and ankerite.
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It also occurs as an alteration in argillaceous sediments or coal beds which contain oxidizing sulfide minerals (pyrite ormarcasite).
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They can also be composed of other minerals that include dolomite, ankerite, siderite, pyrite,marcasite, barite and gypsum.
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The galena forms mats of octahedral crystals, the sphalerite is dense and anhedral and themarcasitepowdery or displays its coxcomb habit.
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The uranium mineral is most commonly uraninite, which occurs with pyrite,marcasite, and chalcopyrite.
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Pyrite is similar tomarcasite, but more stable and less brittle.
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It is associated with magnetite, ilmenite, anatase, pyrite,marcasite, lepidocrocite and goethite.
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Specimens ofmarcasiteoften crumble and break up due to the unstable crystal structure.
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Brazilian coal is characterized by high sulphide contents, pyrite andmarcasite.
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The uranium is contained in autunite, uraninite, and coffinite, with gangue minerals pyrite andmarcasite.
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It occurs in hydrothermal deposits associated with sphalerite, pyrite, chalcopyrite, barite andmarcasite.
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Ore minerals were galena, sphalerite, calcite, andmarcasite.
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The black shales also contain high amounts of sulfides (marcasite, pyrite) and carbon.
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