Prase Opal
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
5.0 – 6.5
Specific Gravity
1.98 – 2.25
Refractive Index
1.37 – 1.47
Crystal System
Amorphous
Luster
Vitreous
Cleavage
None
Fracture
Conchoidal
Color
white
Mohs Hardness
| Mohs | Reference mineral | Prase Opal |
|---|---|---|
| 1 | Talc | |
| 2 | Gypsum | |
| 3 | Calcite | |
| 4 | Fluorite | |
| 5 | Apatite | ● |
| 6 | Orthoclase | ● |
| 7 | Quartz | |
| 8 | Topaz | |
| 9 | Corundum | |
| 10 | Diamond |
Crystal System
Value & Market
Price Tier
Budget (< $50/ct)
Where to Buy Prase Opal
Blue Nile
Fine jewelry retailer
James Allen
Gemstone jewelry
Brilliant Earth
Ethically sourced gems
Amazon
Wide selection
Links may earn a commission at no extra cost to you.
About Prase Opal
Prase Opal is a green variety of common opal whose color is produced by nickel-bearing minerals, giving it a distinctive mint to grass-green appearance without the play of color seen in precious opal. It is found primarily in Tanzania and Poland, where it occurs in ultramafic and serpentinite host rocks. Its uniform green color and waxy luster make it a popular cabochon material for jewelry designers.
On this page
Jewelry Use
Durability
4/10
Science FYI Family
Frequently Asked Questions
What is Prase Opal?
Prase Opal is a green variety of common opal whose color is produced by nickel-bearing minerals, giving it a distinctive mint to grass-green appearance without the play of color seen in precious opal. It is found primarily in Tanzania and Poland, where it occurs in ultramafic and serpentinite host r
What is the hardness of Prase Opal?
Prase Opal has a Mohs hardness of 5.0 to 6.5, making it moderate for use in jewelry.
What color is Prase Opal?
Prase Opal is primarily White.
How much does Prase Opal cost?
Prase Opal falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Prase Opal?
Prase Opal belongs to the Amorphous crystal system.