| 1. | Marcasite reacts more readily than pyrite under conditions of high humidity.
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| 2. | Ore minerals were galena, sphalerite, calcite, and marcasite.
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| 3. | Deeper ore is pitchblende and coffinite with abundant pyrite and marcasite.
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| 4. | Primary ores were created mostly consisting of Sphalerite, Marcasite and Galena.
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| 5. | Marcasite became popular as an understated alternative for the nobility.
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| 6. | In modern English, marcasite is defined scientifically as isometric iron sulfide.
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| 7. | President Clinton said, pointing to my marcasite brooch.
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| 8. | Sulfide minerals such as galena, sphalerite, marcasite and pyrite thus form.
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| 9. | Quartz and marcasite ( typical of a reducing environment ) are quite frequent.
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| 10. | Some are embedded with semi-precious stones like marcasite, amethyst and garnet.
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