Table 4.

Representative chemical composition for sudoite and mixed layers (calculated for O10(OH)8) from sample CL-34.

Mica-sudoite MLPyrophyllite-sudoite
———Sudoite ———— mixed layers —— mixed layers —
123456789101112
(a) assuming all Fe as Fe2+
IVSi3.173.223.403.433.513.563.383.403.493.703.723.77
IVAl0.830.780.600.570.490.440.620.600.510.300.280.23
VIAl2.142.232.182.262.242.202.332.262.092.302.192.72
Fe1.371.331.641.381.551.731.241.461.831.391.660.82
Mg1.811.761.391.381.251.211.601.281.131.271.161.24
K0.000.000.000.090.090.140.230.300.340.090.090.00
Fe/(Fe+Mg)0.430.370.430.500.550.590.440.530.620.500.590.40
∑oct5.325.325.215.025.045.145.175.005.055.095.014.78
(b) normalized to O10(OH)8 and nine cations
IVSi3.063.113.323.423.493.50
IVAl0.940.890.680.580.510.50
VIAl1.932.022.042.242.212.10
Fe3+1.050.870.640.250.230.62
Fe2+0.270.410.960.250.230.62
Mg1.751.701.361.381.241.19
K0.000.000.000.090.090.14