Sillimanite
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Physical & Optical Properties
Category
Semi-Precious Gems
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 | Reference mineral | Sillimanite |
|---|---|---|
| 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 Sillimanite
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 Sillimanite
シリマナイトは高度変成岩中に産する繊維状から柱状のアルミニウムケイ酸塩二形変種で、白色・無色・淡青色・緑色・または灰色を呈し、ガラス質から絹状の光沢を持ちます。透明な宝石品質のものは稀少で、ミャンマーとスリランカ産の青みがかった石や淡緑色のファセット石がコレクターに珍重されています。デラウェア州の州石であり、異なる変成条件を表すアンダルサイト‐藍晶石‐シリマナイトの三形変種の一員でもあります。
On this page
Jewelry Use
Durability
5/10
Science FYI Family
Frequently Asked Questions
What is Sillimanite?
シリマナイトは高度変成岩中に産する繊維状から柱状のアルミニウムケイ酸塩二形変種で、白色・無色・淡青色・緑色・または灰色を呈し、ガラス質から絹状の光沢を持ちます。透明な宝石品質のものは稀少で、ミャンマーとスリランカ産の青みがかった石や淡緑色のファセット石がコレクターに珍重されています。デラウェア州の州石であり、異なる変成条件を表すアンダルサイト‐藍晶石‐シリマナイトの三形変種の一員でもあります。
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.