The principal antimony deposits of Tuscany, Italy, are found in the Manciano district; they form tabular or sheet-like replacement bodies in upper Triassic dolomitic limestones along sedimentary or fault contacts with relatively impermeable Tertiary strata. Antimony is also present in many of the cinnabar deposits of the district, and both ores are believed to be genetically related to the emplacement of the Monte Amiata trachyte dome during the Quaternary.

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