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| Chalcedony Facts | | Author: , 11/29/2004 7:25:10 PM |
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| | Home > GemStones > Chalcedony > General > Facts | Chalcedony Physical Properties Chemical Composition | The chemical composition is Silicon dioxide and the chemical formula is SiO2. | Colours | Varied colours. | Hardness | Varies between 6.5 – 7 Mohs. | Refractive Index | 1.543 - 1.554 | Specific Gravity | 2.65 – 2.67 | Luster | Waxy to dull. | Solid State | Opaque to translucent. Few varieties can be transparent too. | Crystal System | Tetrahedral crystal system. | Cleavage | None | Heat Sensitive | No | Fractures | Conchoidal | Bi-refringence | 0.009 | Pleochroism | None | Source | Worldwide occurrence. Main producers are United States and Brazil. | Enhancement | Not enhanced. | Precautions | Only general gemstone precautions required. |
NOTE – These properties are largely for the Chalcedony as a group name. It is common to almost all the varieties. However, few exceptions would always be present.
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