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labradorite: the gem plagioclase feldspar with play-of-color!
labradorescence is not a display of colors reflected from the surface of a specimen. instead, light enters the stone, strikes a twinning surface within the stone, and reflects from it. the color seen by the observer is the color of light reflected from that twinning surface. different twinning surfaces...
https://geology.com/gemstones/labradorite/