Spectrolite
From The Gemology Project
| Spectrolite | |
|---|---|
| Chemical composition | Plagioclase feldspar |
| Crystal system | Triclinic |
| Habit | Aggregates |
| Hardness | 5-5.5 |
| Optic nature | Biaxial + |
| Refractive index | 1.559-1.570 |
| Birefringence | 0.008-0.011 |
| Dispersion | Low |
| Specific gravity | 2.70 |
| Lustre | Vitreous |
