Glaucophane | |
Chemical Formula |
Na2Mg3Al2Si8O22(OH)2 |
Species |
Silicates |
Crystal System |
Monoclinic |
Mohs Scale |
5-6 |
Specific Gravity |
3-3.15 |
Color |
Gray, lavender-blue |
Streak |
Grayish blue |
Luster |
Vitreous |
Refractive Index |
n = 1.606 - 1.637 n = 1.615 - 1.650 n = 1.627 - 1.655 |
Diaphaneity |
Translucent |
Cleavage |
Good on and on |
Fracture |
Brittle - conchoidal |
Crystal Habit:Massive granular to columnar |