| 1. | Well known types of Chalcedony are Carnelian, Agate and Onyx.
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| 2. | The carnelian is a siliceous stone and a species of chalcedony.
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| 3. | Chalcedony has a waxy luster, and may be semitransparent or translucent.
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| 4. | Chalcedony was once thought to be a fibrous variety of cryptocrystalline quartz.
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| 5. | This petrification process generally results in a quartz chalcedony mineralization.
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| 6. | Chrome chalcedony disappeared from use sometime in the 2nd century.
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| 7. | The color of chalcedony sold commercially is often enhanced by dyeing or heating.
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| 8. | Artificial onyx types have also been produced from common chalcedony and plain agates.
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| 9. | Chrome chalcedony was widely used in jewellery and seals throughout the Roman Empire.
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| 10. | The fossils are hosted in chalcedony rich sedimentary rock.
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