Fig. 6

Chemical compositions of matrices and carbonates. Ternary plots of matrices and carbonate compositions in four Ryugu grains obtained by EDS. a Matrix of each grain. All data plot in between smectite and serpentine compositions. b Bright and dark region of matrix in A0017. Although the bright area shows slightly higher content of Si, both plot within the compositional range of 4 grains shown in a. c Carbonate of each grain. Only C0041 contains Mg–Fe carbonates instead of dolomite