Kornerupine

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Physical & Optical Properties

Mohs Hardness 6.5
Specific Gravity 3.25 – 3.45
Refractive Index 1.66 – 1.685
Crystal System Orthorhombic
Luster Vitreous
Cleavage Good
Fracture Conchoidal
Color various
Birefringence 0.012
Dispersion 0.018
Pleochroism Strong trichroism is common for green variety: green - yellow - reddish brown

Mohs Hardness

Mohs Hardness: 6.5
1 Soft10 Hard

Crystal System

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

Value & Market

Price Tier Moderate ($50-500/ct)

About Kornerupine

Kornerupine is a rare magnesium iron aluminum borosilicate mineral occurring in green, brown, yellow, and colorless transparent prismatic crystals with strong trichroism displaying yellow-brown, green, and sometimes red tones. It was first described in 1884 from Greenland and named after Danish geologist Andreas N. Kornerup, with gem-quality material sourced from Sri Lanka, Madagascar, Tanzania, Myanmar, and Canada. The finest green and cat's-eye varieties are prized by collectors and connoisseurs for their rarity and pleochroic color change.

Jewelry Use

Durability 6/10

Science FYI Family

Frequently Asked Questions

What is Kornerupine?
Kornerupine is a rare magnesium iron aluminum borosilicate mineral occurring in green, brown, yellow, and colorless transparent prismatic crystals with strong trichroism displaying yellow-brown, green, and sometimes red tones. It was first described in 1884 from Greenland and named after Danish geol
What is the hardness of Kornerupine?
Kornerupine has a Mohs hardness of 6.5, making it moderate for use in jewelry.
What color is Kornerupine?
Kornerupine is primarily Various.
How much does Kornerupine cost?
Kornerupine falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Kornerupine?
Kornerupine belongs to the Orthorhombic crystal system.

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