Hexagonite

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Physical & Optical Properties

Mohs Hardness 5.0 – 6.0
Specific Gravity 2.98 – 3.03
Refractive Index 1.599 – 1.637
Crystal System Monoclinic
Luster Vitreous
Cleavage Perfect
Color various
Birefringence 0.023

Mohs Hardness

Mohs Hardness: 5.0 – 6.0
1 Soft10 Hard

Crystal System

β a b c Monoclinic a ≠ b ≠ c, α = γ = 90°, β ≠ 90°

Value & Market

Price Tier Budget (< $50/ct)

About Hexagonite

Hexagonite is a manganese-rich variety of tremolite amphibole, named for the pseudo-hexagonal cross-sections of its prismatic crystals, displaying attractive pale pink to violet hues due to manganese content. It occurs in metamorphic dolomitic marbles and was first described from the Fowler talc mine in New York State, USA, with additional occurrences in New Jersey. The pink to lavender color and translucency of hexagonite are distinctive, and cut specimens are sought by amphibole mineral collectors.

Jewelry Use

Durability 4/10

Science FYI Family

Frequently Asked Questions

What is Hexagonite?
Hexagonite is a manganese-rich variety of tremolite amphibole, named for the pseudo-hexagonal cross-sections of its prismatic crystals, displaying attractive pale pink to violet hues due to manganese content. It occurs in metamorphic dolomitic marbles and was first described from the Fowler talc min
What is the hardness of Hexagonite?
Hexagonite has a Mohs hardness of 5.0 to 6.0, making it moderate for use in jewelry.
What color is Hexagonite?
Hexagonite is primarily Various.
How much does Hexagonite cost?
Hexagonite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Hexagonite?
Hexagonite belongs to the Monoclinic crystal system.

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