Hiddenite

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Physical & Optical Properties

Mohs Hardness 6.0 – 7.0
Specific Gravity 3.15 – 3.21
Refractive Index 1.657 – 1.681
Crystal System Monoclinic
Luster Vitreous
Cleavage Perfect
Fracture Uneven
Color various
Birefringence 0.014
Dispersion 0.017
Pleochroism Distinct trichroism: yellow green - green - blue green

Mohs Hardness

Mohs Hardness: 6.0 – 7.0
1 Soft10 Hard

Crystal System

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

Value & Market

Price Tier Moderate ($50-500/ct)

About Hiddenite

Hiddenite is the rare green variety of spodumene, a lithium aluminum silicate, colored by trace chromium to produce vivid emerald-green to yellowish-green hues with strong pleochroism showing yellow-green, blue-green, and emerald-green depending on viewing direction. It was first discovered at Stony Point, Alexander County, North Carolina, USA, in 1879 by W.E. Hidden, and remains one of the rarest colored gemstones, with limited production from its namesake locality and additional sources in Afghanistan and Brazil. Top-quality chromium-rich hiddenite rivals emerald in color intensity and commands high collector prices.

Jewelry Use

Durability 5/10

Science FYI Family

Frequently Asked Questions

What is Hiddenite?
Hiddenite is the rare green variety of spodumene, a lithium aluminum silicate, colored by trace chromium to produce vivid emerald-green to yellowish-green hues with strong pleochroism showing yellow-green, blue-green, and emerald-green depending on viewing direction. It was first discovered at Stony
What is the hardness of Hiddenite?
Hiddenite has a Mohs hardness of 6.0 to 7.0, making it moderate for use in jewelry.
What color is Hiddenite?
Hiddenite is primarily Various.
How much does Hiddenite cost?
Hiddenite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Hiddenite?
Hiddenite belongs to the Monoclinic crystal system.

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