Green Onyx
A variety of Calcite
What is Green Onyx?
Green Onyx is a false variety of onyx, which usually only occurs in translucent and opaque black and white colors. Onyx is and always has been a popular gemstone, though it has greatly diminished in value over the years. Green Onyx is most commonly a Chalcedony or a variety of silica that has been dyed.
Optical Properties
- Refractive Index
- 1.486-1.658
- Birefringence
- 0.172
- Pleochroism
- None
- Optical Character
- Uniaxial negative
- Dispersion
- 0.008-0.017
Discover Values
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Green Onyx 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.
Green Onyx Localities Map
See where Green Onyx is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Light to dark green with white, red or brown bandings
- Hardness (Mohs)
- 3
- Density
- 2.65 - 2.75 g/cm³
- Streak
- White
- Luster
- Vitreous, Waxy
- Crystal System
- Hexagonal
Chemical Properties
- Chemical Formula
- SiO2
- Elements
- C, Ca, O
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Green Onyx FAQs
How do I identify Green Onyx?
Green Onyx can be identified by its hardness of 3 on the Mohs scale, Light to dark green with white color, Vitreous, Waxy luster, Hexagonal crystal system. Look for these key characteristics when examining specimens.
What color is Green Onyx?
Green Onyx typically appears in Light to dark green with white, red or brown bandings. Color can vary depending on impurities and formation conditions.
How hard is Green Onyx?
Green Onyx has a hardness of 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.