Optical effect exhibited on certain minerals and gemstones where they display a billowy, ghost-like reflection with a bluish-whitish color emanating from the surface. This effect is caused by structur [..]

An effect seen on certain minerals which causes it to display a billowy, rounded, ghost-like reflection with a bluish-whitish color emanating from the surface when the mineral is cut into a cabochon. [..]

Adularescence is an optical phenomenon that manifests as a soft shimmer of light that moves within a gemstone as it is rolled back and forth. This property is most commonly associated with moonstone, a member of the feldspar family.

The display in certain gemstones of a milky, bluish-white, surface sheen. Example: The adularia (moonstone) variety of orthoclase.

A white/blue shimmer which passes across the curved surface of a polished moonstone cabochon due to scattering of light from alternating parallel layers of potassium and sodium rich feldspars.