The Very Highest Quality Chrysoprase Information. . . |
Chrysoprase |
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Sources
Chrysoprase was known from ancient Greek and Roman times, although its ancient source is not known. It has been found at Zabkowice in Silesia, the Urals, California, and other parts of the USA.
Technical Details
Chemical Composition and Name | SiO2 - Silicon Dioxide |
Hardness | 7 |
Specific Gravity | 2.65 - 2.66 |
Refractive Index (R.I.) | 1.543 - 1.552 to 1.545 - 1.554 |
Bi-refringence | 0.009 |
Optic Sign | Positive |
Optical Character | Uniaxial |
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