XXL well-crystallized adularia Former private collection- 1920 g - (1)

Adularia is a form of orthoclase (feldspar), i.e., a potassium aluminum silicate mineral. The color range of this stone includes: colorless, white, yellow, peach, pink, green, or gray. This crystal shows a very distinctive optical effect, characterized by a blue sheen caused by microscopic inclusions and known as “adularescence.” In nature there are several types of “lunar” minerals; this is a stone that belongs to that family. The mineral was discovered in the Alps and is still mined there, where the finest gem-quality specimens are obtained.