Chrysoberyl
44,90 €*
Sofort verfügbar, Lieferzeit: 1-3 Tage
Produktnummer:
9786130812775
The mineral or gemstone chrysoberyl, not to be confused with beryl, is an aluminate of beryllium with the formula BeAl2O4.The name chrysoberyl is derived from the Greek words chrysos and beryllos, meaning a gold-white spar. Despite the similarity of their names, chrysoberyl and beryl are two completely different gemstones. Chrysoberyl is the third-hardest frequently encountered natural gemstone and lies at 8.5 on the hardness scale, between corundum and topaz .An interesting feature of its crystals are the cyclic twins called trillings. These twinned crystals have a hexagonal appearance, but are the result of a triplet of twins with each twin oriented at 120o to its neighbors and taking up 120 of the cyclic trilling. If only two of the three possible twin orientations are present, a V-shaped twin results.
| EAN: | 9786130812775 |
|---|---|
| Sprache: | Englisch |
| Seitenzahl: | 124 |
| Produktart: | kartoniert, broschiert |
| Herausgeber: | Miller, Frederic P. Vandome, Agnes F. McBrewster, John |
| Verlag: | Alphascript Publishing |
| Schlagworte: | Beryllium |
