Sard
is a variety of Chalcedony cryptocrystalline in nature. This reddish tinted version derives its name from the ancient city Sardis. Mixed with white bands, the combined colors create a beautiful stone known as Sardonyx which has historically had very high value.
| Chemical Formula | SiO2 |
| Color | Red, Yellow, Orange, Brown, Pink, White, Gray, Black, Banded, Multicolored |
| Hardness | 6.5Â -Â 7 |
| Crystal System | Hexagonal |
| Refractive Index | 1.54Â -Â 1.55 |
| SG | 2.63Â -Â 2.65 |
| Transparency | Translucent to opaque |
| Double Refraction | .009 |
| Luster | Vitreous to waxy |
| Cleavage | None |
| Mineral Class | Quartz (Chalcedony) |
is a variety of Chalcedony cryptocrystalline in nature. This reddish tinted version derives its name from the ancient city Sardis. Mixed with white bands, the combined colors create a beautiful stone known as Sardonyx which has historically had very high value.
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