Sillimanite

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Physical & Optical Properties

Mohs Hardness 6,0 – 7,5
Specific Gravity 3,2 – 3,26
Refractive Index 1,653 – 1,685
Crystal System Orthorhombic
Cleavage Perfect
Color various
Birefringence 0,014
Pleochroism Strong trichroism is common for green stones: yellowish green - dark green - blue

Mohs Hardness

Mohs Hardness: 6,0 – 7,5
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 Sillimanite

La silimanita es un mineral de silicato de aluminio polimórfico (junto con la andalucita y la distena) que suele aparecer en forma de fibras o cristales prismáticos grises, blancos o azulados. Las variedades transparentes facetables son muy raras y valoradas por los coleccionistas. También se presenta en forma masiva con lustre sedoso. Se forma en metamorfismo de alta temperatura y se encuentra en Sri Lanka, Myanmar, India y algunas localidades europeas.

Jewelry Use

Durability 5/10

Science FYI Family

Frequently Asked Questions

What is Sillimanite?
La silimanita es un mineral de silicato de aluminio polimórfico (junto con la andalucita y la distena) que suele aparecer en forma de fibras o cristales prismáticos grises, blancos o azulados. Las variedades transparentes facetables son muy raras y valoradas por los coleccionistas. También se presen
What is the hardness of Sillimanite?
Sillimanite has a Mohs hardness of 6.0 to 7.5, making it moderate for use in jewelry.
What color is Sillimanite?
Sillimanite is primarily Various.
How much does Sillimanite cost?
Sillimanite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Sillimanite?
Sillimanite belongs to the Orthorhombic crystal system.

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