Adularescence

a billowing flow of whitish or bluish colors that seem to float along the surface; caused by the diffused reflection of light from parallel intergrowths of albite and orthoclase feldspar.
Found on http://gemologyproject.com/wiki/index.php?title=Glossary_of_Terms

adularescence

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. It is caused by structural anomalies or build up of water in the mineral. The minerals most famous for exhibiting adularescence are Opal and Moonston...
Found on http://www.encyclo.co.uk/local/22291

Adularescence

A white or bluish reflection coming from a definite plane in a mineral when the stone is turned. The name comes from the feldspar variety adularia and is best known in the moonstone gemstones.
Found on http://www.allaboutgemstones.com/glossary_gemology.html

ADULARESCENCE

An optical phenomenon applied to orthoclase or adulria feldspar that exhibits a floating, billowy, white or bluish light effect.
Found on http://www.agt-gems.com/Book/Glossary/

adularescence

bluish sheen exhibited by some feldspars -- e.g., moonstone -- when light is reflected from certain directions; cf. labradorescence.
Found on https://www.encyclo.co.uk/local/20132

Adularescence

Bluish-white schiller which appears on the surface in moonstone.
Found on https://www.encyclo.co.uk/local/20501
No exact match found