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Scanning electron micrographs (SEM and FESEM) of calcium sulphate crystals precipitated in solid media. (a), (b), and (c) show polyhedral and pseudospheres shapes and EDX spectrum. (a) and (b) also show some spherulites of carbonate. (d) is detail of (c), where the surface of a biolith of sulphate mineral without mineralised cells can be observed. (e) and (f) show different morphologies of sulphate bioliths. (e) shows small spheres of calcium carbonate.
