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Definition of labradorescence

A type of schiller, an iridescent optical interference of light caused by diffraction from microscopic sub-surface exsolution lamellae in some Labradorite samples, in particular where it contains appreciable K. This is due to the presence of a miscibility gap, causing exsolution of orthoclase. Labradorite, a Na-rich anorthite feldspar, showing this effect has been termed spectrolite, and can form a syenitic rock called larvikite, used as a building stone.

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