| 词汇 | marcasite |
| 释义 | marcasite noun[ U ] uk /ˈmɑː.kə.saɪt/ us /ˈmɑːr.kə.saɪt/ a mineral that can be cut and made to look like precious stones and is used to make jewellery白铁矿石（加工后看似宝石，用于制造廉价珠宝） cl2004lhy/iStock/Getty Images Plus/GettyImages Geology: precious & semi-precious stones amber blood diamond carbuncle carnelian conflict diamond cornelian cultured pearl gem gemmy jet malachite onyx opal pearl precious stone ruby semiprecious topaz turquoise unset You can also find related words, phrases, and synonyms in the topics: Geology: types of rock Examples of marcasitemarcasite The carbonate minerals, calcite, dolomite and ankerite were precipitated, with stringers of marcasite and trace chalcopyrite. These deposits are hosted in competent strata with sulphide mineralogies of galena + sphalerite + chalcopyrite + pyrite + marcasite and associated carbonates + quartz + baryte. Galena, sphalerite, pyrite and marcasite are the main sulphide minerals, with associated calcite, dolomite, quartz and ankerite. It also occurs as an alteration in argillaceous sediments or coal beds which contain oxidizing sulfide minerals (pyrite or marcasite). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They can also be composed of other minerals that include dolomite, ankerite, siderite, pyrite, marcasite, barite and gypsum. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The galena forms mats of octahedral crystals, the sphalerite is dense and anhedral and the marcasite powdery or displays its coxcomb habit. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The uranium mineral is most commonly uraninite, which occurs with pyrite, marcasite, and chalcopyrite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Pyrite is similar to marcasite, but more stable and less brittle. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is associated with magnetite, ilmenite, anatase, pyrite, marcasite, lepidocrocite and goethite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Specimens of marcasite often crumble and break up due to the unstable crystal structure. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Brazilian coal is characterized by high sulphide contents, pyrite and marcasite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The uranium is contained in autunite, uraninite, and coffinite, with gangue minerals pyrite and marcasite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It occurs in hydrothermal deposits associated with sphalerite, pyrite, chalcopyrite, barite and marcasite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Ore minerals were galena, sphalerite, calcite, and marcasite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The black shales also contain high amounts of sulfides (marcasite, pyrite) and carbon. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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