Orthoclase is a moderately cheap transparent stone that is colourless or pale yellow and can have a bluish white schiller, or sheen. The colourless variety is called adularia, as it was found at Mount Adular in Switzerland, and it is from this name that the term adularescence derives. Orthoclase is usually faceted as a step cut because of its fragility, and for this reason it is not widely produced or used.