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Definition of adularescence

A floating, billowy, white or bluish light, seen in certain directions as a cabachoned gemstone or mineral(usually adularia) is turned around. It is caused by diffused reflections of light from parallel intergrowths or exsolutions of another feldspar or other mineral of slightly different refractive index from the main mass. Adularia, a low temperature K-feldspar, when showing well developed schiller, due to microperthite, i.e exsolution of albite, is classified as a semi-precious gemstones known as moonstone.

Ref: CMD
Ref: Webster 3rd

Variety of: schiller

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