Template:Datolite
From The Gemology Project
Datolite | |
---|---|
Chemical composition | CaB[OH|SiO4] |
Crystal system | Monoclinic |
Habit | Short prisms, porcelaneous cryptocrystalline aggregates |
Cleavage | None |
Fracture | Conchoidal to uneven |
Hardness | 5 - 5.5 |
Optic nature | Biaxial - |
Refractive index | 1.622 - 1.670 |
Birefringence | 0.044 |
Specific gravity | 2.95 - 3.0 |
Lustre | Vitreous to porcelainous |