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Dendritic agate is a whitish-gray or colorless chalcedony with tree- or fern-like markings known as dendrites. The dendrites in dendritic agate are iron or manganese inclusions, usually brown or black in color. Though they appear organic due to their fern-like structure, they are actually inorganic; they are formed at fine fracture surfaces through crystallization of weathered solutions of neighboring rock.

Dendritic agate is a whitish-gray or colorless chalcedony with tree- or fern-like markings known as dendrites. The dendrites in dendritic agate are iron or manganese inclusions, usually brown or black in color. Though they appear organic due to their fern-like structure, they are actually inorganic; they are formed at fine fracture surfaces through crystallization of weathered solutions of neighboring rock.

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