Tantalite

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Physical & Optical Properties

Mohs Hardness 6,0 – 6,5
Specific Gravity 5,18 – 8,2
Refractive Index 2,19 – 2,457
Crystal System Orthorhombic
Luster Submetallic
Cleavage Distinct
Fracture Sub-Conchoidal
Color various
Birefringence 0,083
Pleochroism Sometimes strong

Mohs Hardness

Mohs Hardness: 6,0 – 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 Tantalite

Tantalite is a primary ore mineral of tantalum, forming black to reddish-brown to brownish-black prismatic crystals with a submetallic to resinous luster in granitic pegmatites worldwide. It belongs to the columbite-tantalite series and is found notably in Nigeria, Democratic Republic of Congo, Brazil, and Australia. Tantalum, extracted from tantalite, is a critical metal in modern electronics including capacitors in smartphones and computers, making tantalite a mineral of significant economic and strategic importance.

Jewelry Use

Durability 5/10

Science FYI Family

Frequently Asked Questions

What is Tantalite?
Tantalite is a primary ore mineral of tantalum, forming black to reddish-brown to brownish-black prismatic crystals with a submetallic to resinous luster in granitic pegmatites worldwide. It belongs to the columbite-tantalite series and is found notably in Nigeria, Democratic Republic of Congo, Braz
What is the hardness of Tantalite?
Tantalite has a Mohs hardness of 6.0 to 6.5, making it moderate for use in jewelry.
What color is Tantalite?
Tantalite is primarily Various.
How much does Tantalite cost?
Tantalite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Tantalite?
Tantalite belongs to the Orthorhombic crystal system.

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