Common feldspar of hightemperature granites, syenites, highgrade metamorphic rocks, and felsic extrusive rocks. Synonyms of OrthoclaseHide. Argillyite. Common Feldspar. Cottaite. Leelite. Muldan. Murchisonite. K Feldspar (in part) Potash Feldspar (in part) Other Language Names for OrthoclaseHide. Bulgarian: Ортоклаз. Croatian: Ortoklas. Dutch: Orthoklaas. French: Orthose. German: Ort