• (n.) A variety of albite, white and lamellar in structure.
(from the article `feldspar`) ...(Polarized refers to light that vibrates in a single plane.) Plagioclase feldspars that constitute lamellar masses in complex pegmatites are ...
Cleave'land·ite noun [ From Professor Parker Cleaveland .] (Min.) A variety of albite, white and lamellar in structure. 
Cleavelandite, named after professor Parker Cleaveland, is a variety of albite, white and lamellar in structure.