Emerald vs Peridot
Emerald and Peridot are easy to confuse. Here’s how they stack up on the properties that actually separate them.
| Emerald | Peridot | |
|---|---|---|
| Also known as | Beryl (Beryl family) | Olivine (Olivine family) |
| Colour | Green | Green, Yellow, Brown |
| Mohs hardness | 7.5–8 | 6.5–7 |
| Lustre | Vitreous | Vitreous to oily |
| Streak | White | Colorless |
| Crystal system | Hexagonal (6/m 2/m 2/m) Space group: P6/mсc | Orthorhombic |
| Transparency | Transparent to opaque | Translucent to transparent |
| Cleavage | Imperfect on the [0001] | Poor on {010} and {110}, {010} cleavage improves with increasing iron content |
| Fracture | Conchoidal | Conchoidal |
| Chemical formula | Be 3 Al 2 ( SiO 3 ) 6 | — |
| Specific gravity | Average 2.76 | 3.2–4.3 |
Read the full guides
Frequently asked questions
What's the easiest way to tell Emerald from Peridot?
Hardness is the quickest test: Emerald is Mohs 7.5–8 and Peridot is Mohs 6.5–7.