Pleonaste
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
8.0
Specific Gravity
3.8
Refractive Index
1.78
Crystal System
Isometric
Luster
Vitreous
Cleavage
None
Color
various
Mohs Hardness
| Mohs | Reference mineral | Pleonaste |
|---|---|---|
| 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
Fine ($500-5,000/ct)
Where to Buy Pleonaste
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 Pleonaste
Pleonaste is a dark, iron-rich variety of spinel that ranges from deep black to dark greenish-black, with a vitreous to submetallic luster. It forms as an accessory mineral in metamorphic and igneous rocks, commonly found in Sri Lanka, Madagascar, and parts of Europe. Though rarely used as a gemstone, its intense dark color and cubic crystal habit make it a distinctive collector's specimen.
On this page
Jewelry Use
Durability
9/10
Suitable for daily wear
Science FYI Family
Frequently Asked Questions
What is Pleonaste?
Pleonaste is a dark, iron-rich variety of spinel that ranges from deep black to dark greenish-black, with a vitreous to submetallic luster. It forms as an accessory mineral in metamorphic and igneous rocks, commonly found in Sri Lanka, Madagascar, and parts of Europe. Though rarely used as a gemston
What is the hardness of Pleonaste?
Pleonaste has a Mohs hardness of 8.0, making it excellent for use in jewelry.
What color is Pleonaste?
Pleonaste is primarily Various.
How much does Pleonaste cost?
Pleonaste falls into the Fine ($500-5,000/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Pleonaste?
Pleonaste belongs to the Isometric crystal system.