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A tetragonal mineral, 4[TiO2 ] ; trimorphous with rutile and brookite; brown, greenish-gray, or black; in hydrothermal veins around granite pegmatites, as an alteration of titanium minerals, and as detrital grains. Formerly called octahedrite. See also: octahedrite; titanium dioxide; xanthitane.
Source: Dictionary of Mining, Mineral, and Related Terms

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