Achroite
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
7.0 – 7.5
Specific Gravity
2.9 – 3.4
Refractive Index
1.614 – 1.666
Crystal System
Trigonal
Luster
Vitreous
Cleavage
Indistinct
Fracture
Uneven,Conchoidal
Color
various
Birefringence
0.014
Dispersion
0.017
Mohs Hardness
| Mohs | Reference mineral | Achroite |
|---|---|---|
| 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
Moderate ($50-500/ct)
Where to Buy Achroite
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 Achroite
Achroite is the colorless, transparent variety of tourmaline, prized for its exceptional clarity and brilliant luster. It forms in granitic pegmatites and is relatively rare compared to its colored tourmaline counterparts. Collectors and gemologists value achroite for its purity and its ability to display the trigonal crystal structure of tourmaline in its most unadorned form.
On this page
Jewelry Use
Durability
7/10
Suitable for daily wear
Science FYI Family
Frequently Asked Questions
What is Achroite?
Achroite is the colorless, transparent variety of tourmaline, prized for its exceptional clarity and brilliant luster. It forms in granitic pegmatites and is relatively rare compared to its colored tourmaline counterparts. Collectors and gemologists value achroite for its purity and its ability to d
What is the hardness of Achroite?
Achroite has a Mohs hardness of 7.0 to 7.5, making it excellent for use in jewelry.
What color is Achroite?
Achroite is primarily Various.
How much does Achroite cost?
Achroite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Achroite?
Achroite belongs to the Trigonal crystal system.