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Albany Amorphous Sulfur analysis ancylite associated columbite Berman Bitterroot black Bureau of Mines Burova Calcium Niobate cell dimensions Central Urals chemical cited in footnote COLUMBATE Columbite Masses comparison crystal fragments CRYSTALLOGRAPHY Dark Star claim description of fersmite Doklady fersmite described Fersmite Ravalli County fine-grained Geol Grayish-brown greenish yellow Immersion Media inclusions and intergrowths Indices of refraction intergrown fersmite locality for fersmite Louis Erickson Merwin metamorphosed MINERAL FROM MONTANA mineralogical examination Monazite Mont Montana fersmite occurs as small optical data optical properties Oreg original description parallel to 100 Pegmatite physical properties Pleochroism properties of fersmite prospector's sample pycnometer RARE CALCIUM rare calcium-columbate mineral rare-earth Ravalli County fersmite Report of investigations reported by Bohnstedt-Kupletskaya Russia Russian fersmite Sahinen second reported occurrence small anhedral inclusions SPACE GROUP specific gravity Subconchoidal Brittle tantalum tantalum-free columbite unique occurrence UNIT CELL Ural Mountains Vischnevye Mountains Vishnevye Mountains Vishnevye Mts X-ray diffraction data X-ray spectrographic