God for us to design products, we are the porters of nature!
| Sillimanite | |
Chemical Formula |
Al2SiO5 |
Species |
Silicates |
Crystal System |
Orthorhombic |
Mohs Scale |
6-7 |
Specific Gravity |
3.24 |
Color |
Colorless or white to gray, also brown, yellow, yellow-green, gray-green, blue-green, blue; colorless in thin section |
Streak |
White |
Luster |
Sub-Vitreous, Greasy, Silky |
Refractive Index |
n = 1.653 - 1.661 n = 1.654 - 1.670 n = 1.669 - 1.684 |
Diaphaneity |
Transparent, Translucent |
Cleavage |
Perfect perfect |
Fracture |
Irregular/Uneven |
| Crystal Habit：Prismatic crystals, fibrous, acicular | |
| Geological Setting：High pressure and high temperature thermal aureoles around intrusive rocks. Similar conditions in regionally metamorphosed rocks. | |
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