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Cave Pearls, formed as dripping water rich in calcium salts deposits calcite around a small nucleus (often a sand grain). The constant movement of each cave pearl by the dripping water keeps them
Septarian concretion or (septarian nodules) from Morocco. Dense mass formed by precipitation of mineral cement in sedimentary rock or soil which is later cracked and filled with other material
Sectioned fossil ammonite where the shell material has been replaced by pyrites, and the empty cavities of the shell have filled during fossilisation with crystalised yellow/green calcite preserving
