Methods By retrospective investigation, 672 accidents of the color mineral mountain in 35 years were studied.

方法对该有色矿山近35年来所发生的672起工伤事故进行回顾性调查分析。

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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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The gems are olivine--a mineral class that includes semiprecious peridot--and can range in color from deep green to bright yellow.

FORBES: Hot Rocks

The mineral composition of each of the Canyon's 15 dominant layers influences the stone's color, type and texture a variety that is all the more evident on the side-canyon detours.

WSJ: The Grand Canyon's Secret Network