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Labradorite is a calcium-rich plagioclase feldspar mineral valued for labradorescence, an optical effect in which internal reflections produce shifting blue, green, yellow, or other colors as the stone moves relative to light. It occurs in igneous rocks such as anorthosite and is used as an ornament...
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Spectrolite is a trade name commonly used for a dark, strongly iridescent variety of labradorite feldspar associated with Finland. Its polished surfaces can display vivid blue, green, yellow, orange, and violet flashes caused by the feldspar's internal optical structure, a phenomenon known as labrad...
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