The play of colours visible in some feldspar of labradorite composition is due to very fine-grained exsolution lamellae.
This labradorescence, or schiller effect, is the result of light diffraction within the lamellar intergrowths – fine, adjacent layers of the separate materials (lamellae) comprising the whole rock phase – created when conditions do not allow for sufficient diffusion to the materials' equilibrium composition.
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