Minerals which are capable of this reversible color change by exposure to UV (or other energy sources), without any change in their essential composition, are said to be tenebrescent
Posted on February 13, 2023
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Recently I posted a question about Afghan sodalite (hackmanite) after reviewing the MinRec article about Sar-E-Sang. Someone reminded me that there was a large discussion on this topic last year. I dug out that discussion and copied it here to the blog. This is one reason we created Nature's Rainbows - to capture these excellent discussions.
Posted on February 13, 2023
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Tenebrescence of Greenland sodalite is amazing. This is a piece of a deeply tenebrescent sodalite.
Posted on February 13, 2023
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Tenebrescence is when minerals change color when exposed to sunlight, also known as reversible photochromism.
Posted on February 13, 2023
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