Term: Aluminoceladonite

Aluminoceladonite

A dioctahedral member of the true mica group. The end-member formula is KAl(Mg,Fe3+)□Si4O10(OH)2, where □ = vacancy. Typical range in composition is: viR2+ / (viR2+ + viR3+) ≥ 0.25, viAl / (viAl + viFe3+) = 0.5 – 1.0, Mg / (Mg + viFe2+) > 0.5 (Rieder et al., 1998).