Chrysoprase
Precious Gemstone
What is Chrysoprase?
Chrysoprase is a gemstone variety of chalcedony, a cryptocrystalline form of silica, which contains small quantities of nickel. Its color is normally apple-green, but varies to a deeper green. The color is caused by the presence of nickel compounds. Chrysoprase is valued as a gemstone and is often used in jewelry.
Optical Properties
- Refractive Index
- 1.530-1.540
- Birefringence
- Weak
- Pleochroism
- Weak
- Optical Character
- Uniaxial or Biaxial
- Dispersion
- Low
Chrysoprase Market Value Calculator
Estimate the market value of Chrysoprase using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Chrysoprase Localities Map
See where Chrysoprase is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Map preview
North ZoneCentral RidgeSouth Basin
Quick Facts
Physical Properties
- Color
- Apple-green, deep green
- Hardness (Mohs)
- 6.5 to 7
- Density
- 2.57 to 2.64 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- (SiO2)·nH2O + Ni
- Elements
- Silicon, Oxygen, Nickel
Also Known As
ChrysophrasePrase
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