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特性 properties | 合成紅/藍星光 created star ruby created star sapphire | 天然紅/藍星光 natural star ruby natural star sapphire |
類別 classification | 剛玉 corundum | 剛玉 corundum |
化學成份 chemical composition | ai2o3 | ai2o3 |
硬度(摩氏) hardness (mohs) | 9.0 | 9.0 |
折射率 refractive index | 1.760-1.769 | 1.760-1.768 |
比重(g /cm3) specific gravity | 3.98-3.99 | 3.90-4.01 |
熔點 melting point | 2,320oc | 2,050oc |