Labradorite with linear iridescence

Labradorite with linear iridescence

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Labradorite, also known as Spectrolite, is the aluminum-silicate variety of an extensive group of rock-forming minerals called feldspars. Its large, tabular crystals often display iridescence, a changeable display of colors resulting from the interference of light reflected by the semi-translucent, lamellar crystal planes. The lamellar and iridescent character of labradorite is well demonstrated on this polished cut of a rounded pebble of the rock. Actual width of specimen is 50 mm, provenance unknown.

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Keywords: aluminium, aluminum silicate, changeable, color, crystal, crystalline, cut, feldspar, iridescence, iridescent, labradorite, lamellar, mineral, no-one, nobody, polished, reflection, rock, section, sectioned, stone, surface

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