Tantalite

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Physical & Optical Properties

Category Semi-Precious Gems

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 of Tantalite shown against the ten reference minerals, from talc (1) to diamond (10).

Mohs	Reference mineral	Tantalite
1	Talc
2	Gypsum
3	Calcite
4	Fluorite
5	Apatite
6	Orthoclase	●
7	Quartz
8	Topaz
9	Corundum
10	Diamond

Crystal System

Value & Market

Price Tier Moderate ($50-500/ct)

Where to Buy Tantalite

Blue Nile Fine jewelry retailer

James Allen Gemstone jewelry

Brilliant Earth Ethically sourced gems

Amazon Wide selection

Links may earn a commission at no extra cost to you.

About Tantalite

タンタライトはタンタルの主要な鉱石鉱物で、花崗岩ペグマタイトに黒色から赤褐色の稜柱状から板状の結晶として産出し、亜金属から脂質の光沢を持ちます。コンゴ民主共和国、オーストラリア、ブラジル、ナイジェリアが主要な産地です。タンタルは電子機器、航空宇宙部品、外科用インプラントに不可欠な金属で、コンゴ産のコルタン（コルンバイト‐タンタライト）は重要な戦略的資源となっています。

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