Achroite

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Physical & Optical Properties

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 Hardness: 7.0 – 7.5
1 Soft10 Hard

Crystal System

a a a Trigonal (Rhombohedral) a = b = c, α = β = γ ≠ 90°

Value & Market

Price Tier Moderate ($50-500/ct)

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.

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.

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