Chrysoprase
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
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Chrysoprase before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Quick Facts
Physical Properties
- Color
- Apple-green, deep green
- Hardness (Mohs)
- 6.5 to 7
- Rock tumbling
- Tumbles well
- Density
- 2.57 to 2.64 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- (SiO2)·nH2O + Ni
- Elements
- Silicon, Oxygen, Nickel
Also Known As
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Chrysoprase FAQs
How do I identify Chrysoprase?
Chrysoprase can be identified by its hardness of 6.5 to 7 on the Mohs scale, Apple-green color. Look for these key characteristics when examining specimens.
What color is Chrysoprase?
Chrysoprase typically appears in Apple-green, deep green. Color can vary depending on impurities and formation conditions.
How hard is Chrysoprase?
Chrysoprase has a hardness of 6.5 to 7 on the Mohs scale. This gives it moderate hardness.