Green Onyx
A variety of Calcite
Uncommon
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
Rarity
3.8out of 5.0
76%
Popularity
4.2out of 5.0
84%
Beauty
4.3out of 5.0
86%
Cultural Value
3.8out of 5.0
76%
Collection Value
4.2out of 5.0
84%
Green Onyx Market Value Calculator
Estimate the market value of Green Onyx using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
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.
Map preview
North ZoneCentral RidgeSouth Basin
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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