Manganese dendrites on limestone
From collection Pseudofossil collection by Lukas Wallentin
Manganese dendrites on limestone
This specimen consists of a flat, fine-grained limestone matrix featuring prominent dendritic formations. These dendrites exhibit a complex, arborescent (tree-like) growth habit, branching outward in a fractal pattern. The color of the dendritic mineral ranges from dark brown to nearly black, creating a high-contrast visual against the pale beige or cream-colored background of the stone. These structures are pseudofossils, formed by the crystallization of manganese oxides from mineral-rich solutions penetrating bedding planes or fractures in the rock. The surface of the specimen is matte and non-reflective, typical of both the sedimentary host rock and the thin mineral film of the dendrites. The branching is dense at the base and becomes more delicate and spaced toward the tips, illustrating a classic example of diffusion-limited aggregation in mineral growth.
MnO2 on CaCO3
Brown
3.00 Mohs
Very good
Dekorativ
Opak
Dark brown to black
Matte
Intricate dark brown branching patterns on a light beige limestone matrix.
