Template:Willemite
From The Gemology Project
Willemite | |
---|---|
Chemical composition | Zn2SiO4 |
Crystal system | Trigonal |
Habit | prismatic; massive |
Cleavage | indistinct |
Fracture | Conchoidal to irregular |
Hardness | 5.5 |
Optic nature | Uniaxial + |
Refractive index | 1.691 - 1.725 |
Birefringence | n d |
Dispersion | n d |
Specific gravity | 3.89 - 4.19 |
Lustre | Vitreous to resinous |
Fluorescence | green to yellow |