Granite GS‐N and Potash Feldspar FK‐N are two ANRT reference samples prepared in 1973 in 960 and 567 kg, respectively. All data reported since 1973 are compiled in this report. GS‐N and FK‐N are now well characterized for major and minor elements. As for trace elements, working values have been assigned for 36 elements in GS‐N and for 30 elements in FK‐N. We need much more data on trace elements for characterizing them better. As GS‐N and FK‐N are still available in large quantities and are certain to remain so for two or three decades to come, a plea is made for contribution of more data on