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摘要: 坦桑尼亚Umba谷的电气石，随光通过电气石的路径长度的增加，其颜色由绿变为红。这种颜色变化称为“Usambara”效应，与以前描述的任何颜色变化效应是不同的。采用比色法对这种电气石进行分析、分析结果表明，Usambara效应是一种复杂现象，它包括光路径长度不同而造成的变色效应和不同光源下观察到的变色故应（变石效应）
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