benitoite

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benitoite

mineral

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structure

In mineral: Cyclosilicates
The rare titanosilicate benitoite (BaTiSi₃O₉) is the only mineral that is built with the simple Si₃O₉ ring. Axinite [(Ca, Fe, Mn)₃Al₂(BO₃)(Si₄O₁₂)(OH)] contains Si₄O₁₂ rings, along with BO₃ triangles and OH groups. The two common and important cyclosilicates,
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