gorgeousgeology:

Moonstone video showing light diffraction within a micro-structure consisting of regular of feldspar layers called Lamellae.

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Moonstone is composed of two feldspar species, orthoclase and albite.

The two intermingle and as the newly formed mineral cools, the intergrowth of orthoclase and albite separates into stacked, alternating layers called Lamellae. When light falls between these thin, flat layers, it scatters in many directions producing the phenomenon called adularescence.