Omphacite | |
Chemical Formula |
(Ca,Na)(Mg,Fe2+,Al)Si2O6 |
Species |
Silicates |
Crystal System |
Monoclinic |
Mohs Scale |
5-6 |
Specific Gravity |
3.16-3.43 |
Color |
Green to dark green; colorless to pale green in thin section |
Streak |
Greenish white |
Luster |
Vitreous to silky |
Refractive Index |
n = 1.662 - 1.701 n = 1.670 - 1.712 n = 1.685 - 1.723 |
Diaphaneity |
Translucent |
Cleavage |
Distinct/Good |
Fracture |
Uneven to conchoidal |
Crystal Habit:Rarely in rough crystals; anhedral, granular to massive |