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A triclinic phase of tricalcium silicate (TI) was investigated using transmission electron microscopy (TEM). Electron diffraction patterns were analyzed by introducing a subcell with the cell parameters of a ‫؍‬ 7.081 Å, b ‫؍‬ 7.043 Å, c ‫؍‬ 25.230 Å, ␣ ‫؍‬ 89.97°, ␤ ‫؍‬ 90.37°, and ␥ ‫؍‬ 119.44°. It was proven that the coordinates of all the reflections can be expressed to be ha* ؉ kb* ؉ lc* ؎ m/6(a* ؉ 2b* ؉ 2c*), where m ‫؍‬ 0, 1, 2, and 3. The result indicates that the structure modulation in TI is a one-dimensional type with a structural modulation normal to (122). The modulated structure could be observed in a highresolution TEM image as wavy contrast streaking parallel to the plane with an interval of six times the (122) spacing.

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