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Definition of labradorescence
A type of schiller, an iridescent-like optical interference of light caused bydiffraction from microscopic, pervasive sub-surfaceexsolution lamellae in somelabradorite samples (rarely also in somebytownite), in particular where it contains appreciable K. This is due to the presence of amiscibility gap, causing exsolution oforthoclase. Labradorite, a Na-richanorthite feldspar, showing this effect has been termedspectrolite, and can form a syenitic rock calledlarvikite, used as a building stone.
Compare withiridescence.
Compare withiridescence.
Labrador
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2025, except where stated. Most political location boundaries are© OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 byJolyon Ralph.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844.doi:10.2138/am-2024-9486.
Privacy Policy -Terms & Conditions -Contact Us / DMCA issues -Report a bug/vulnerabilityCurrent server date and time: November 28, 2025 22:07:56