Morganite is the pink variety of the mineral beryl. Traces of manganese cause its color.
Properties
| Refractive index | 1.583 to 1.590 (GIA); 1.572 to 1.600 (IGS) |
|---|---|
| Birefringence | 0.007 to 0.008 |
| Optic character | Doubly refractive (uniaxial) |
| Dispersion | 0.014 |
| Specific gravity | 2.80 to 2.91 |
| Hardness (Mohs) | 7.5 to 8 |
| Crystal system | Hexagonal |
| Pleochroism | Distinct: pale pink, bluish pink |
| Absorption spectrum | Not recorded |
Published values. They change a little from stone to stone. Our tools do not model morganite yet. Sources: GIA · International Gem Society · LibreTexts Gemology
In more detail
It belongs to the same species as emerald and aquamarine. Morganite is almost always heat treated, because heat removes a yellow or orange tinge. It is a durable gem, but do not expose it to heat. Ultrasonic and steam cleaners are usually safe, except for stones with liquid inclusions or fractures.
Related terms
- Beryl: Beryl is the mineral species of emerald. Aquamarine and the other beryl colors belong to the same species.
- Aquamarine: Aquamarine is the green-blue to blue variety of the mineral beryl. Emerald and morganite belong to the same species.
- Emerald: Emerald is the green to bluish green variety of the mineral beryl. Chromium, vanadium or both cause its color.
- Heat treatment: Heat treatment is controlled heating of a gem to change its color or clarity.