藍(lán)寶石 ??????Sapphire

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藍(lán)寶石的化學(xué)成分為（），因含微量元素鈦（Ti⁴⁺）或鐵（Fe²⁺）而呈藍(lán)色。透明度為透明至半透明，并帶有玻璃。為1.76-1.77，雙折射率0.008. 硬度為9，3.95-4.1克/立方厘米。實(shí)際上自然界中的寶石級(jí)剛玉除紅色的稱(chēng)外，其余各種顏色如藍(lán)色、淡藍(lán)色、綠色、黃色、粉色、灰色等，均稱(chēng)為藍(lán)寶石。世界藍(lán)寶石產(chǎn)地不多，主要有、、、、等，但就寶石品質(zhì)而言，以緬甸、斯里蘭卡品質(zhì)最佳。

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The chemical composition of Sapphire is Al₂O₃.The color is blue due to trace elements of titanium (Ti⁴⁺) or iron (Fe²⁺).Transparence of Sapphire is transparent to translucent, and has glass luster. Refractive index is 1.76-1.77, double index is 0.008-0.010.The hardness of Sapphire is 9,density is 3.95-4.10 g/cm³.Actually,all kinds color of Sapphire in the nature like blue, light blue, green, yellow, pink, and gray, are known as Sapphire. There are not so many original place of Sapphire in the world. The main places are Myanmar, Sri Lanka, Thailand, Australia, and China. The best quality Sapphire are from Myanmar and Sri Lanka.

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