標 本 名: | クリソベリル (Chrysoberyl) / アレキサンドライト (Alexandrite)
| 化学組成: | BeAl2O4 | サ イ ズ: | | 重量: | | 透明: | | 数量: | | 産地: | Emerald mines (Izumrudnye Kopi; Malyshevskoe deposit), Tokovaya river (Tokovaia river), Malyshevo, Ekaterinburg (Sverdlovsk), Ekaterinburgskaya (Sverdlovskaya) Oblast', Middle Urals, Urals Region, ロシア ( Russia) | Here you get several alexandrite crystals as well as colorless chrysoberyl in the mica schist matrix. the bigger chrysoberyl crystals disclosing almost no fracture planes and the greenish to bluish partly violet coloration in incandescent light, while in daylight the color becomes bright to darker green! The area with the strongest color change is below the slightly more outstanding crystal. A great specimen from the Ural Mountains in Russia.
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