Collier's New Encyclopedia (1921)/Tungstite

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TUNGSTITE, a mineral occurring mostly as an earthy incrustation, but has been found in distinct cubic crystals at St. Leonard, near Limoges, France. Color, bright yellow or yellow-green. Composition: Oxygen, 20.7; tungsten, 79.3=100, with the formula WO3. Called also tungstic acid and tungstic ocher.