Img: Tourmaline with Albite (Cleavlandite) Alternative names Although Albite is often called White Feldspar  and Plagioclase , it is actually an isomorphous solid solution series of the Plagioclase Feldspar group. Whilst it is technically correct to call it either of those names, it is a broad name for it as Albite is at one end of the spectrum of plagioclase feldspars, containing sodium and no calcium and Anorthite is at the other end of the plagioclase feldspar spectrum, co