Search for: [Characteristics of the object- texture/facture = "flint structure is crypto\- or micro\-crystalline, sometimes patchy, spherulitic relict\-organogenic\; fauna remains visible in the matrix are most often sponge needles \(spiculae\), rarerly foraminifera tests and radiolaria shells\; coloured in different shades of brown\; visible cloudiness\; on their surface also small spots of differet shapes"]

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