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| tenebrescence ： ウィキペディア英語版 |
tenebrescence
Tenebrescence, also known as ''reversible photochromism'', is the ability of minerals to change colour when exposed to sunlight. The effect can be repeated indefinitely, but is destroyed by heating.
Tenebrescent minerals include hackmanite sodalite, spodumene and tugtupite.
Tenebrescent behavior is exploited in synthetic materials for the manufacture of self-adjusting sunglasses, which darken on exposure to sunlight.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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