celadonite

mineral

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June 24, 2026

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Celadonite is a soft, earthy mineral with a green color. It is composed of silicates of iron, magnesium, and potassium. Celadonite belongs to the mica group of minerals, which have a specific layered structure. In celadonite, some silicon atoms are replaced by aluminum, creating a charge imbalance that is balanced by potassium ions between these layers. It is a ferric iron-rich dioctahedral mica.12

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clay mineral
Mica mineral group
Celadonite and glauconite are ferric iron-rich species of dioctahedral micas. The ideal composition of celadonite may be expressed by K(Mg, Fe³⁺)(Si_{4 - x}Al_x)O₁₀(OH)₂, where x = 0–0.2. Glauconite is a dioctahedral mica species with tetrahedral Al substitution greater than 0.2 and octahedral Fe³⁺ or R³⁺
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Celadonite and glauconite are ferric iron-rich species of dioctahedral micas. The ideal composition of celadonite may be expressed by K(Mg, Fe³⁺)(Si_{4 - x}Al_x)O₁₀(OH)₂, where x = 0–0.2. Glauconite is a dioctahedral mica species with tetrahedral Al substitution greater than 0.2 and octahedral Fe³⁺ or R³⁺
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