The Blue Lagoon is a mineral-rich seawater lake heated by lava.

蓝泻湖是一个由火山熔岩形成的咸水湖，富含矿物质。

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This cut topaz gemstone shows off its striking blue coloration, but the mineral also occurs in a colorless form or with a yellow or green color.

这颗经过切割的黄晶闪耀着夺目的蓝色光芒，但是这种宝石也有无色的，也有黄色或绿色的。

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If the mineral has a blue color it's known as a sapphire.

如果矿物是蓝色的，那就是蓝宝石。

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In 2009, Afghanistan declared Band-e-Amir, a collection of six mineral-rich, piercingly blue lakes, a national park in hopes of protecting and promoting its landscape.

BBC: Birth and spread of the world��s national parks