Gemstones with RI 1.480
3 gemstones have a refractive index range that includes 1.480. Refractive index measures how much light bends when entering a gem — it's one of the most diagnostic properties for identification. Measured with a gemological refractometer.
| Gemstone | RI Range | SG Range | Crystal System | Optic Character |
|---|---|---|---|---|
| Moldavite | 1.480 – 1.510 | 2.32 – 2.38 | Amorphous | SR |
| Obsidian | 1.480 – 1.510 | 2.30 – 2.60 | Amorphous | SR |
| Chrysocolla | 1.460 – 1.630 | 2.00 – 2.40 | Amorphous | AGG |