Clades:
Orthoclase variety; feldspars.
Chemical: (Na,K)AlSi3O8.
Synonym: Hecatolite.
Name: derived from a visual effect, sheen or schiller, adularescence.
Lustre: pearly and opalescent schiller, caused by light diffraction within a micro-structure consisting of regular exsolution layers (lamellae) of different alkali feldspars (orthoclase and sodium-rich plagioclase).