Ekanite

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Physical & Optical Properties

Mohs Hardness 6.0 – 6.5
Specific Gravity 3.28 – 3.32
Refractive Index 1.593 – 1.596
Crystal System Tetragonal
Luster Vitreous
Cleavage Distinct
Fracture Uneven
Color various
Birefringence 0.001

Mohs Hardness

Mohs Hardness: 6.0 – 6.5
1 Soft10 Hard

Crystal System

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

Value & Market

Price Tier Moderate ($50-500/ct)

About Ekanite

Ekanite is an extremely rare calcium thorium silicate mineral found in gem-quality form only as river gravel pebbles from Sri Lanka, named after F.L.D. Ekanayake who first brought it to scientific attention. It is one of very few naturally radioactive gemstones cut and sold—its thorium content causes internal structural damage over time through a process called metamictization. Fine transparent green ekanite displays an attractive four-rayed asterism and is among the world's rarest faceted gemstones.

Jewelry Use

Durability 5/10

Science FYI Family

Frequently Asked Questions

What is Ekanite?
Ekanite is an extremely rare calcium thorium silicate mineral found in gem-quality form only as river gravel pebbles from Sri Lanka, named after F.L.D. Ekanayake who first brought it to scientific attention. It is one of very few naturally radioactive gemstones cut and sold—its thorium content cause
What is the hardness of Ekanite?
Ekanite has a Mohs hardness of 6.0 to 6.5, making it moderate for use in jewelry.
What color is Ekanite?
Ekanite is primarily Various.
How much does Ekanite cost?
Ekanite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Ekanite?
Ekanite belongs to the Tetragonal crystal system.

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