標 本 名: | コランダム (鋼玉), サファイア (Corundum, Variety: Sapphire)
| 化学組成: | Al2O3 | サ イ ズ: | | 重量: | | 透明: | | 数量: | | 産地: | Gem gravels around Ratnapura, Ratnapura District, Sabaragamuwa Province , スリランカ (Sri Lanka) | Here you get an unheated star Sapphire, besides hexagonal zoning the stone displays two stars! Double asterism is caused by sapphire twinning, around the c-axis of each crystal the center of a star can be formed. Fine reference specimen for this rare asterism variety.
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