Listing ID #3228834
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| Chemical | (Mg, Fe)2SiO4, with Mg in greater quantities than Fe. |
|---|---|
| Composition | Peridot is a member of an isomorphous series with forsterite (magnesium silicate) and fayalite (iron silicate) as 'end members' of this olivine series. |
| Crystal system | Orthorhombic. |
| Cleavage | Poor. |
| Hardness | 6.5 – 7 on moh’s scale |
| Specific gravity | 3.32 to 3.37 |
| Colour | Pale yellowish-green to deep green, greenish-brown to brown (rare). |
| Pleochroism | Weak, green and yellowish-green. |
| Lustre | Vitreous, sometimes appears oily. |
| Refractive index | 1.65 to 1.69 |
| Birefringence | 0.036 Inclusions and facet edges may appear doubled through the 10x lens. |
| Dispersion | Medium. |
| Optical nature | Biaxial. |
| Inclusions | Black chromite crystals which induce flat stress cracks - these resemble water-lily leaves. Mica flakes - these may give the stone a slightly brownish hue. In larger stones inclusions appear doubled due to the large double refraction. |
| Localities | Main sources of gem material include China, Myanmar (Mogok district), Pakistan, USA (Arizona) and Zabargad (S1, John's Island) in the Red Sea. |
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