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Sodalite

Sodalite

Sodalite is probably  more familiar to the lapidary specialist than to the specime mineral collector, as it often has an attractive blue, green or red color, the blue reminiscent of lapis lazuli. It is also found as color less or gray. Hackmanite is a variety of sodalite exhibiting the astonishing property known as tenebrescence or photochromism.

A freshly broken piece of hackmanite will show a red or pink-purple surface. After a few minutes of sunlight or strong withe (halogen/led light) the color will more or less completely fade away, revealing the withe, yellow gren color of the minerals. On exposure to a frw minutes of short wave ultraviolet, the color will return as strong as before. This cycle of color change can be repeated indefinitely.

Outstanding sodalite or hackmanite spicimens are a spiciality fore the Ilimanusaq in Greenland, and in som Canadian material.

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Sep 13, 2016

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