Schiavinatoite Schiavinatoite is a very rare mineral , a natural niobium borate of the formula BO 4 . Schiavinatoite is classified as monoborate. It contains tetrahedral borate anion instead of planar BO3 group, which is more common among minerals . Schiavinatoite is one of the most simple niobium minerals. It forms a solid solution with its tantalum-analogue, béhierite . Both minerals possess zircon-type structure and occur in pegmatites . Schiavinatoite and nioboholtite are minerals with essential niobium and boron .Schiavinatoite was detected in miaroles of a pegmatite at Antsongombato, Madagascar. It coexists with an apatite-group mineral, béhierite, danburite , elbaite–liddicoatite, feldspar , pollucite , quartz , rhodizite , and spodumene .The main facts about schiavinatoite's structure:
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