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[heading centered=”no” margin_bottom=”yes” large=”no” background=”yes”]Marble at the microscope[/heading]
Thick strata of limestone and dolostone from the Jurassic and Cretaceous period make up the mass of Monte Tuttavista (805m, north-westerly facing), at Orosei, the world’s only site for Daino Imperiale.
The carbonate basement is composed at the base by brown dolostone with arenaceous limestone interlays, followed by lighter stratified limestone, occasionally hazelnut in colour.
The lithology of Mesozoic limestone includes marble with the most diverse range of colours and veining, all present in the area of Orosei
and available from Sardegna Marmi.
Chiaro Marble (Daino Imperiale – Fiocco di neve, Perlato and Nuvolato varieties) is composed of micrite (krypton calcite and microcrystalline) with interclasts (autochthonous fragments, caused by destruction of the limestone formed in the same field by waves) and bioclasts, also micrite, with microcrystalline calcite veining that binds together the tectonic cracks, improving the mechanical and material characteristics as a result (fig. A e B).
Medium-Veined (Venato Medio) Marble is made up of bioclastic granules, foraminifers (fragments of fossils and algae, and interclasts of microcrystalline calcite in a mosaic of partially recrystallized calcitic micrites (fig. C).
From: “Lapidei Ornamentali della Sardegna – Manuale tecnico”, Consorzio Ventuno.