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PraseBack to A - Z IndexChard 24 Carat Home Page
Bi-coloured Amethyst Citrine
Prase is Related to Amethyst and Citrine
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Prase
Prase is a dull green variety of chalcedony which is cryptocrystalline quartz. Its dull green colour is due to the presence of masses of hair-like inclusions of actinolite. It is usually cut en cabochon, or into beads.

Technical Details
Chemical Composition and NameSiO2 - Silicon Dioxide
Hardness7
Specific Gravity2.65 - 2.66
Refractive Index (R.I.)1.543 - 1.552 to 1.545 - 1.554
Bi-refringence0.009
Optic SignPositive
Optical CharacterUniaxial


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