Leonard James Spencer, 1911 Encyclopædia Britannica, Volume 8… (1911)
“ The most pronounced lamination is that parallel to the orthopinacoid; another, less distinct, is parallel to the basal plane, and a third parallel to the plane of symmetry; these planes of secondary parting are in addition to the ordinary prismatic cleavage of all pyroxenes. Frequently the material is interlaminated with a rhombic pyroxene (bronzite) or with an amphibole (smaragdite or uralite) , the latter being an alteration product of the diallage. ”
