Sunstone is a plagioclase feldspar, which when viewed from certain directions exhibits a brilliant spangled appearance; this has led to its use as a gemstone.
| Color | Colorless, Yellow, Red, Green, Blue, and Copper Shiller |
| Mohs scale hardness | 6.0 - 6.5 |
| Specific gravity | 2.55 - 2.76 |
| Refractive index | 1.560 - 1.572 |