General Formula: (X,Y,Z)₂O₆

X: larger cation - M₂ site distorted octahedron: Ca²⁺, Na⁺, Mn²⁺, Fe²⁺, Mg²⁺

Y: M₁ octahedral site: Fe²⁺, Mg²⁺, especially Fe³⁺, Al³⁺, Cr³⁺

Z: tetrahedral site (4CN): Si⁴⁺, Al³⁺

 

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