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 home learning library chalcedony
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Fast Facts
| Chalcedony is a species name for all cryptocrystalline (fine-grained) quartzes as well as the name of a specific gemstone in that species. The actual chalcedony gemstones come in a range of blue-white-gray hues. |
| Chalcedony is listed as one of the stones in the foundation of the city walls of the New Jerusalem in Revelation (21:19). |
| Its durability, beauty, and abundance made chalcedony one of the earliest raw materials used by humans. |
Originally shaped into knives, tools, and containers, chalcedony eventually was used as an adornment, sometimes even carved into cameos.
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Sources for chalcedony include Brazil, India, Madagascar, Namibia, Zimbabwe, Sri Lanka, Uruguay, and the United States (California).
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Chalcedony represents a family of fine-grained (cryptocrystalline) quartz crystals including agate, chyrsoprase, bloodstone, jasper, carnelian, moss agate, onyx, and sard, as well as one variety known specifically as chalcedony. On Mohs’ scale of hardness, all chalcedonies are 6.5 – 7. In its natural state, chalcedony has a waxy or dull luster.
Color
The actual chalcedony stone itself is bluish-white-gray.
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| Learn more about this and other gemstones, by reading one of the many fine gemstone books available from Jewelry Television®.
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