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
矽线石是铝硅酸盐系列中的一种纤维状至柱状多晶矿物，产于高温变质岩中，与蓝晶石和红柱石同质异象。宝石级矽线石较为罕见，切割后呈现玻璃光泽，最优质的刻面宝石产自缅甸、斯里兰卡和印度。其白色至灰色的纤维集合体有时能产生猫眼效应。
On this page
Jewelry Use
Durability
5/10
Science FYI Family
Frequently Asked Questions
What is Sillimanite?
矽线石是铝硅酸盐系列中的一种纤维状至柱状多晶矿物，产于高温变质岩中，与蓝晶石和红柱石同质异象。宝石级矽线石较为罕见，切割后呈现玻璃光泽，最优质的刻面宝石产自缅甸、斯里兰卡和印度。其白色至灰色的纤维集合体有时能产生猫眼效应。
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.