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

1 Talc 2 Gypsum 3 Calcite 4 Fluorite 5 Apatite 6 Orthoclase 7 Quartz 8 Topaz 9 Corundum 10 Diamond Simpsonite
Mohs hardness of Simpsonite shown against the ten reference minerals, from talc (1) to diamond (10).
Mohs Reference mineral Simpsonite
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase
7 Quartz
8 Topaz
9 Corundum
10 Diamond

Crystal System

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

Value & Market

Price Tier Moderate ($50-500/ct)

About Simpsonite

A simpsonite é um mineral de tantalato de alumínio muito raro que forma cristais hexagonais tabulares, normalmente creme, amarelo pálido ou incolores, com um lustre vítreo a gorduroso. Ocorre em pegmatitos ricos em tântalo, sendo os exemplares mais conhecidos provenientes da Austrália Ocidental. A sua raridade extrema e a pequena dimensão dos cristais tornam as pedras talhadas uma raridade absoluta para colecionadores especializados.

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Jewelry Use

Durability 7/10

Suitable for daily wear

Science FYI Family

Frequently Asked Questions

What is Simpsonite?
A simpsonite é um mineral de tantalato de alumínio muito raro que forma cristais hexagonais tabulares, normalmente creme, amarelo pálido ou incolores, com um lustre vítreo a gorduroso. Ocorre em pegmatitos ricos em tântalo, sendo os exemplares mais conhecidos provenientes da Austrália Ocidental. A s
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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