Moonstone
FeldsparJewelryWiki Editorial·3 sources·Reviewed 2026-07-31
A feldspar showing adularescence — the floating blue sheen — caused by light scattering between internal layers.
Properties
| Property | Value | Authority |
|---|---|---|
| Refractive index | 1.518–1.526 [1] | — |
| Specific gravity | 2.56–2.59 [1] | — |
| Crystal system | Monoclinic [3] Read from the species article, Orthoclase. | — |
| Birthstone month | June — one of three official June stones, with pearl and alexandrite. [2] | — |
Sources
- International Gem Society — reference charts (Mohs hardness, specific gravity, refractive index) — International Gem Society (IGS reference charts)
- Jewelers of America — Birthstones — Jewelers of America (Jewelers of America, Birthstones)
- Wikipedia — mineral article infoboxes (crystal system) — Wikipedia contributors (Wikipedia mineral infoboxes)