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. ...
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http://en.wikipedia.org/wiki/Tenebrescence
The property that some minerals and phosphors show or darkening in response to radiation of one wavelength and then reversibly bleaching on exposure to a different wavelength. This phenomenon is also called reversible photochroism.
Found on
http://www.encyclo.co.uk/local/22291
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