It was named after its locality in Adula Massif, Switzerland (Ticino, Tessin) by Ermenegildo Pini (Italian priest, naturalist, mathematican, geologist, philosopher) in 1780. Adularia is a variety of orthoclase wich belongs to the felspar group, potassium-aluminium-silicate mineral. Moonstone is also adularia. The whitish, sometimes bluish play of light can be seen on moonstone is called adularization. It can be found in joints of hydrotermal and alpine types of rocks often with chlorite inclusions. Its crystals often look like orthorhombic, but they are monoclinic. Localities: Switzerland, Austria, USA, India, Pakistan.