Outer surface of phosphorite concretion from Podolia. This phosphorite consist of podolite = carbonat-hydroxyl-apatite. Associating minerals (unvisible on this photo, but accesible on the locality page) are galena, white kaolin group mineral and black goethite encrustation of inner cavity of the concretion. Specimen size is 4x3x2.5 cm. Pavel M. Kartashov collection and photo.
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