A

David

Darling

labradorite

labradorite

Labradorite showing iridescent colors due to interference of light caused by the reflection from thin lamellar inclusions of various minerals. Credit: R. Weller/Cochise College.


Labradorite is a variety of plagioclase feldspar, consisting of albite and anorthite, commonly occurring in basalt and gabbro. Gray to black in color, it often shows blue, green, or red iridescence, and hence is used as a gemstone and for building.