Orthorhombic, metamict, AB2O6-type rare earth Ti-Nb-Ta oxides have VHN50 values ranging from 633 to 746. VHN60 increases to approximately 1000 for annealed specimens. Reflectances measured in air vary from 11.9 to 15.6 (470nm),11.7 to 15.6 (546nm), 11.0 to 15.0 (589nm) and 11.6 to 15.0 (650nm). Variations in reflectance are due more to alteration than variation in weight percent TiO2, Nb2O5. A symmetric correlation matrix is calculated for all data.

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