emmerichite

/EH1 M EH1 ER0 IY1 CH AY1 T/
noun
  1. 1

    (mineralogy) A vitreous brown mineral with chemical formula Ba₂Na(Na,Fe²⁺)₂(Fe³⁺,Mg)Ti₂(Si₂O₇)₂O₂F₂.

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