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Name Origin: the term beryl as a gem covers all those varieties of the beryl group that are neither emerald nor aquamarine.
Main Colors: golden yellow, greenish-yellow, yellow, pink, colorless.
Producing Countries: can be found in Brazil, Madagascar, Namibia, Nigeria, Zimbabwe, and Sri Lanka.
Common Shapes: traditional shapes are more common, including ovals, drops, rounds, and cushions. Fancy shapes are also always available, such as trillions, hearts, briolets, and flower cuts. Beryl is an excellent material often used for gemstone carvings and ornamental designs.
Usual Treatment: golden beryl is practically untreated.
| Species: | BERYL GROUP |
|---|---|
| Hardness of Mohs: | 7.5/8.0 |
| Specific Density: | 2.66/2.87 |
| Cleavage: | Indistinct |
| Fracture: | Concoid, splintered |
| Crystal System: | Hexagonal, hexagonal prisms. |
| Chemical Composition: | Be3AI2(SiO3)6 |
| Transparency: | Transparent to opaque |
| Refractive Index: | 1.562/1.602 |
| Birefringence: | -0.004 a – 0.010 |
| Dispersion: | 0.014 (0.009-0.013) |
| Pleochroism: | Weak; golden yellow; yellowish-green |
| Luster: | Vitreous |
| Fluorescence: | Usually none |
Belo Horizonte – MG
