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Tugtupite is a rare beryllium aluminum silicate mineral in the feldspathoid group. It is best known from localities in Greenland, where it occurs in alkaline igneous rocks and may appear white, pink, red, or violet. Some specimens show tenebrescence, meaning that their color changes or intensifies a...
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Hackmanite is a variety of sodalite known for tenebrescence, the temporary development or strengthening of color after exposure to ultraviolet light. The color change can fade when the material is left in ordinary light, although the strength and duration vary among specimens. Hackmanite may appear...
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