Fig. 57.-Swapped rows of albite present on the border between two chessboard albite

It is reasonably suggested that the swapped albite rows are formed when the two predecessors of the chessboard albite were former K-feldspars. Later, the two K-feldspars were converted to chessboard albite during co-orientation replacement of albitization. So the swapped albite (of hetero-orientation replacive origin) should be formed earlier than the chessboard albite (of co-orientation replacive origin). Sodic metasomatite from Gaoxi medium-coarse grained biotite granite, Zhuguangshan batholith, Jiangxi Province.