“…The observed COR(s) between rutile and the host crystal is then determined by the alignment of the close‐packed oxygen arrays of the two structures. Orientation relationships controlled by the oxygen‐packing scheme are also noted in oxide‐silicate systems, such as topotactic relationships of ilmenite, hematite or magnetite in olivine (Champness, ; Dobrzhinetskaya, Green, & Wang, ; Hwang, Shen, Chu, & Yui, ; Hwang et al, ; Risold, Trommsdorff, & Grobéty, ), magnetite in clinopyroxene (Hwang et al, ), rutile in biotite (Shau, Yang, & Peacor, ), as well as rutile in chrysoberyl (Drev, Komelj, Mazaj, Daneu, & Rečnik, ).…”