We have found the rare mineral kassite, CaTi2O4(OH)2, in an unusual rock from Josephine Creek, Oregon. Using electron-diffraction techniques, kassite was observed to have a b-centered orthorhombic unit cell with dimensions a = 0.908, b = 0.478, and c = 0.523 nm. This cell is closely related to that given in the original description of kassite (Kukharenko et al., 1965) rather than the cell given in a more recent article by Evans et al. (1986). A crystal structure for kassite based on that of CaSb2O6 is proposed.

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