Orthoclase ma'adinai ne kuma nau'in feldspar ne. Kalmar "orthoclase" ta samo asali ne daga kalmomin Helenanci "orthos," ma'ana madaidaiciya, da "klasis," ma'ana karaya, saboda tsagewarta na musamman. Orthoclase yana da nau'in sinadari na silicate na potassium aluminium kuma yawanci fari ne, ruwan hoda, ko launin nama. Ana samun ta a cikin duwatsu masu ƙura, kamar granite, kuma ana amfani da ita wajen kera yumbu da gilashi.