Читать книгу Monument Future - Siegfried Siegesmund - Страница 40

Carbonate rock (pseudo-breccia, limestone). Colour: red to purple with white, purple or pink irregular spots and very thin grey or purple veins. Mineral: calcite. Decay morphologies: surface erosion, sulphate skin formation, chromatic alte-ration. Geology: “Calcare mas-siccio” formation (Hettangian, lower Lias) of the non-metamorphic series of Tuscany. Quarry: Caldana (south of Gavorrano, Grosseto province). Use: polished slabs mainly for flooring in residential buildings together with other coloured marbles, Casa Wassermann). A significant use is displayed on the great staircases of Milan’s Stazione Centrale (U. Stacchini 1912/31): the big shafts are made assembling moulded pieces of curvilinear shape and pieces of fluted shape.