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Name Origin: despite its name, Chrysoberyl is not part of the famous Beryl gemstone family. They share the presence of the mineral beryl but, on the other hand, have a totally different chemical composition and crystal structure. Its name comes from the Greek word for gold, chrysós.
Main Colors: golden yellow, yellowish green, pale, and red.
Producing Countries: there are notable sources of Chrysoberyl in Brazil, Myanmar, Sri Lanka, Australia, India, Tanzania, Madagascar, and the United States.
Common Shapes: they are usually cut as emerald, antique and brilliant.
Usual Treatment: there is usually no specific treatment for chrysoberyl. But, some of them can be treated through fracture filling, irradiation, and coating.
| Species: | GARNET GROUP |
|---|---|
| Hardness of Mohs: | 8.5 |
| Specific Density: | 3.70/3.78 |
| Cleavage: | Good |
| Fracture: | Conchoid, weak |
| Crystal System: | Orthorhombic, prismatic crystals germinated by penetration. |
| Chemical Composition: | AL2BeO4 |
| Transparency: | Transparent |
| Refractive Index: | 1.746-1.763 |
| Birefringence: | 0.007 - 0.011 |
| Dispersion: | 0.015 (0.011) |
| Pleochroism: | Very weak: reddish-yellow, yellow, light green, green |
| Luster: | Vitreous |
| Fluorescence: | Usually none |
Belo Horizonte – MG
