Simpsonite

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Physical & Optical Properties

Mohs Hardness 7.0 – 7.5
Specific Gravity 5.9 – 7.3
Refractive Index 1.994 – 2.04
Crystal System Trigonal
Cleavage Indistinct
Fracture Conchoidal
Color various
Birefringence 0.046
Pleochroism Nil

Mohs Hardness

Mohs Hardness: 7.0 – 7.5
1 Soft10 Hard

Crystal System

a a a Trigonal (Rhombohedral) a = b = c, α = β = γ ≠ 90°

Value & Market

Price Tier Moderate ($50-500/ct)

About Simpsonite

Simpsonite is a very rare aluminum tantalate mineral that forms tabular hexagonal crystals, typically cream, pale yellow, or colorless, with a vitreous to resinous luster. It occurs in lithium-bearing granitic pegmatites and is found at the Tabba Tabba mine in Western Australia, its type locality, as well as in Portugal. It is named after Edward Sydney Simpson, an Australian mineralogist, and specimens are primarily of interest to collectors of rare tantalum-bearing minerals.

Jewelry Use

Durability 7/10

Suitable for daily wear

Science FYI Family

Frequently Asked Questions

What is Simpsonite?
Simpsonite is a very rare aluminum tantalate mineral that forms tabular hexagonal crystals, typically cream, pale yellow, or colorless, with a vitreous to resinous luster. It occurs in lithium-bearing granitic pegmatites and is found at the Tabba Tabba mine in Western Australia, its type locality, a
What is the hardness of Simpsonite?
Simpsonite has a Mohs hardness of 7.0 to 7.5, making it excellent for use in jewelry.
What color is Simpsonite?
Simpsonite is primarily Various.
How much does Simpsonite cost?
Simpsonite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Simpsonite?
Simpsonite belongs to the Trigonal crystal system.

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